diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 57053c3645..3af1709774 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -199,8 +199,7 @@ jobs:
       - common
     outputs:
       integration-tests: ${{ steps.determine.outputs.integration-tests }}
-      integration-tests-run-all: ${{ steps.determine.outputs.integration-tests-run-all }}
-      integration-test-files: ${{ steps.determine.outputs.integration-test-files }}
+      integration-test-buckets: ${{ steps.determine.outputs.integration-test-buckets }}
       clang-tidy: ${{ steps.determine.outputs.clang-tidy }}
       clang-tidy-mode: ${{ steps.determine.outputs.clang-tidy-mode }}
       python-linters: ${{ steps.determine.outputs.python-linters }}
@@ -243,8 +242,7 @@ jobs:
 
           # Extract individual fields
           echo "integration-tests=$(echo "$output" | jq -r '.integration_tests')" >> $GITHUB_OUTPUT
-          echo "integration-tests-run-all=$(echo "$output" | jq -r '.integration_tests_run_all')" >> $GITHUB_OUTPUT
-          echo "integration-test-files=$(echo "$output" | jq -c '.integration_test_files')" >> $GITHUB_OUTPUT
+          echo "integration-test-buckets=$(echo "$output" | jq -c '.integration_test_buckets')" >> $GITHUB_OUTPUT
           echo "clang-tidy=$(echo "$output" | jq -r '.clang_tidy')" >> $GITHUB_OUTPUT
           echo "clang-tidy-mode=$(echo "$output" | jq -r '.clang_tidy_mode')" >> $GITHUB_OUTPUT
           echo "python-linters=$(echo "$output" | jq -r '.python_linters')" >> $GITHUB_OUTPUT
@@ -267,12 +265,16 @@ jobs:
           key: components-graph-${{ hashFiles('esphome/components/**/*.py') }}
 
   integration-tests:
-    name: Run integration tests
+    name: Run integration tests (${{ matrix.bucket.name }})
     runs-on: ubuntu-latest
     needs:
       - common
       - determine-jobs
     if: needs.determine-jobs.outputs.integration-tests == 'true'
+    strategy:
+      fail-fast: false
+      matrix:
+        bucket: ${{ fromJson(needs.determine-jobs.outputs.integration-test-buckets) }}
     steps:
       - name: Check out code from GitHub
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
@@ -299,19 +301,14 @@ jobs:
         run: echo "::add-matcher::.github/workflows/matchers/pytest.json"
       - name: Run integration tests
         env:
-          INTEGRATION_TEST_FILES: ${{ needs.determine-jobs.outputs.integration-test-files }}
-          INTEGRATION_TESTS_RUN_ALL: ${{ needs.determine-jobs.outputs.integration-tests-run-all }}
+          # JSON array of test paths; parsed into a bash array below to avoid
+          # shell word-splitting / glob hazards.
+          BUCKET_TESTS: ${{ toJson(matrix.bucket.tests) }}
         run: |
           . venv/bin/activate
-          if [[ "$INTEGRATION_TESTS_RUN_ALL" == "true" ]]; then
-            echo "Running all integration tests"
-            pytest -vv --no-cov --tb=native -n auto tests/integration/
-          else
-            # Parse JSON array into bash array to avoid shell expansion issues
-            mapfile -t test_files < <(echo "$INTEGRATION_TEST_FILES" | jq -r '.[]')
-            echo "Running ${#test_files[@]} specific integration tests"
-            pytest -vv --no-cov --tb=native -n auto "${test_files[@]}"
-          fi
+          mapfile -t test_files < <(echo "$BUCKET_TESTS" | jq -r '.[]')
+          echo "Bucket ${{ matrix.bucket.name }}: running ${#test_files[@]} integration tests"
+          pytest -vv --no-cov --tb=native -n auto "${test_files[@]}"
 
   cpp-unit-tests:
     name: Run C++ unit tests
diff --git a/esphome/components/beken_spi_led_strip/light.py b/esphome/components/beken_spi_led_strip/light.py
index 31572cd800..9093b08b62 100644
--- a/esphome/components/beken_spi_led_strip/light.py
+++ b/esphome/components/beken_spi_led_strip/light.py
@@ -62,6 +62,7 @@ CONF_IS_WRGB = "is_wrgb"
 SUPPORTED_PINS = {
     libretiny.const.FAMILY_BK7231N: [16],
     libretiny.const.FAMILY_BK7231T: [16],
+    libretiny.const.FAMILY_BK7238: [16],
     libretiny.const.FAMILY_BK7251: [16],
 }
 
diff --git a/esphome/components/esp32/printf_stubs.cpp b/esphome/components/esp32/printf_stubs.cpp
index 386fbbd79d..908b4023ea 100644
--- a/esphome/components/esp32/printf_stubs.cpp
+++ b/esphome/components/esp32/printf_stubs.cpp
@@ -13,14 +13,21 @@
  * and printf() calls in SDK components are only in debug/assert paths
  * (gpio_dump_io_configuration, ringbuf diagnostics) that are either
  * GC'd or never called. Crash backtraces and panic output are
- * unaffected — they use esp_rom_printf() which is a ROM function
+ * unaffected; they use esp_rom_printf() which is a ROM function
  * and does not go through libc.
  *
- * These stubs redirect through vsnprintf() (which uses _svfprintf_r
- * already in the binary) and fwrite(), allowing the linker to
- * dead-code eliminate _vfprintf_r.
+ * On picolibc (default for IDF >= 5 on RISC-V, IDF >= 6 everywhere) we
+ * route output through a stack-allocated cookie FILE that forwards each
+ * byte to the real target stream via fputc(). Picolibc's tinystdio
+ * vfprintf walks the FILE::put callback one character at a time, so this
+ * costs ~32 bytes of stack for the cookie struct vs. a 512-byte format
+ * buffer. The buffered path overflows the loopTask stack on IDF 6.
  *
- * Saves ~11 KB of flash.
+ * On newlib (IDF <= 5 on Xtensa) we keep the original snprintf-then-fwrite
+ * path because that loopTask stack budget has plenty of headroom for the
+ * 512-byte buffer; the picolibc-only crash above does not affect it.
+ *
+ * Saves ~11 KB of flash on newlib, ~2.8 KB on picolibc.
  *
  * To disable these wraps, set enable_full_printf: true in the esp32
  * advanced config section.
@@ -30,10 +37,55 @@
 #include <cstdarg>
 #include <cstdio>
 
+#ifndef __PICOLIBC__
 #include "esp_system.h"
+#endif
 
 namespace esphome::esp32 {}
 
+// NOLINTBEGIN(bugprone-reserved-identifier,cert-dcl37-c,cert-dcl51-cpp,readability-identifier-naming)
+extern "C" {
+
+#ifdef __PICOLIBC__
+
+#include <cstddef>
+#include <type_traits>
+
+extern int __real_vfprintf(FILE *stream, const char *fmt, va_list ap);
+
+namespace {
+
+struct CookieFile {
+  FILE base;
+  FILE *target;
+};
+
+// cookie_put() recovers CookieFile* from FILE* via reinterpret_cast, which is
+// only well-defined when FILE is the first member at offset 0 and CookieFile
+// is standard-layout.
+static_assert(offsetof(CookieFile, base) == 0, "FILE must be the first member of CookieFile");
+static_assert(std::is_standard_layout<CookieFile>::value, "CookieFile must be standard-layout");
+
+int cookie_put(char c, FILE *stream) {
+  auto *cookie = reinterpret_cast<CookieFile *>(stream);
+  return fputc(static_cast<unsigned char>(c), cookie->target);
+}
+
+const FILE COOKIE_FILE_TEMPLATE = FDEV_SETUP_STREAM(cookie_put, nullptr, nullptr, _FDEV_SETUP_WRITE);
+
+}  // namespace
+
+int __wrap_vfprintf(FILE *stream, const char *fmt, va_list ap) {
+  CookieFile cookie;
+  cookie.base = COOKIE_FILE_TEMPLATE;
+  cookie.target = stream;
+  return __real_vfprintf(&cookie.base, fmt, ap);
+}
+
+int __wrap_vprintf(const char *fmt, va_list ap) { return __wrap_vfprintf(stdout, fmt, ap); }
+
+#else  // !__PICOLIBC__
+
 static constexpr size_t PRINTF_BUFFER_SIZE = 512;
 
 // These stubs are essentially dead code at runtime — ESPHome replaces the
@@ -55,14 +107,18 @@ static int write_printf_buffer(FILE *stream, char *buf, int len) {
   return len;
 }
 
-// NOLINTBEGIN(bugprone-reserved-identifier,cert-dcl37-c,cert-dcl51-cpp,readability-identifier-naming)
-extern "C" {
-
 int __wrap_vprintf(const char *fmt, va_list ap) {
   char buf[PRINTF_BUFFER_SIZE];
   return write_printf_buffer(stdout, buf, vsnprintf(buf, sizeof(buf), fmt, ap));
 }
 
+int __wrap_vfprintf(FILE *stream, const char *fmt, va_list ap) {
+  char buf[PRINTF_BUFFER_SIZE];
+  return write_printf_buffer(stream, buf, vsnprintf(buf, sizeof(buf), fmt, ap));
+}
+
+#endif  // __PICOLIBC__
+
 int __wrap_printf(const char *fmt, ...) {
   va_list ap;
   va_start(ap, fmt);
@@ -71,11 +127,6 @@ int __wrap_printf(const char *fmt, ...) {
   return len;
 }
 
-int __wrap_vfprintf(FILE *stream, const char *fmt, va_list ap) {
-  char buf[PRINTF_BUFFER_SIZE];
-  return write_printf_buffer(stream, buf, vsnprintf(buf, sizeof(buf), fmt, ap));
-}
-
 int __wrap_fprintf(FILE *stream, const char *fmt, ...) {
   va_list ap;
   va_start(ap, fmt);
diff --git a/esphome/components/esp32_hosted/__init__.py b/esphome/components/esp32_hosted/__init__.py
index 1619a845d8..eca7c24b10 100644
--- a/esphome/components/esp32_hosted/__init__.py
+++ b/esphome/components/esp32_hosted/__init__.py
@@ -246,9 +246,10 @@ async def to_code(config):
     idf_ver = esp32.idf_version()
     os.environ["ESP_IDF_VERSION"] = f"{idf_ver.major}.{idf_ver.minor}"
     if idf_ver >= cv.Version(5, 5, 0):
-        esp32.add_idf_component(name="espressif/esp_wifi_remote", ref="1.4.0")
-        esp32.add_idf_component(name="espressif/eppp_link", ref="1.1.4")
-        esp32.add_idf_component(name="espressif/esp_hosted", ref="2.12.1")
+        esp32.add_idf_component(name="espressif/esp_wifi_remote", ref="1.5.1")
+        esp32.add_idf_component(name="espressif/wifi_remote_over_eppp", ref="0.3.2")
+        esp32.add_idf_component(name="espressif/eppp_link", ref="1.1.5")
+        esp32.add_idf_component(name="espressif/esp_hosted", ref="2.12.6")
     else:
         esp32.add_idf_component(name="espressif/esp_wifi_remote", ref="0.13.0")
         esp32.add_idf_component(name="espressif/eppp_link", ref="0.2.0")
diff --git a/esphome/components/host/core.cpp b/esphome/components/host/core.cpp
index b067ebbf6e..9123975884 100644
--- a/esphome/components/host/core.cpp
+++ b/esphome/components/host/core.cpp
@@ -1,74 +1,16 @@
 #ifdef USE_HOST
 
 #include "esphome/core/application.h"
-#include "esphome/core/hal.h"
-#include "esphome/core/helpers.h"
 #include "preferences.h"
 
 #include <csignal>
-#include <sched.h>
-#include <time.h>
-#include <cstdlib>
 
 namespace {
 volatile sig_atomic_t s_signal_received = 0;  // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
 void signal_handler(int signal) { s_signal_received = signal; }
 }  // namespace
 
-namespace esphome {
-
-void HOT yield() { ::sched_yield(); }
-uint32_t IRAM_ATTR HOT millis() {
-  struct timespec spec;
-  clock_gettime(CLOCK_MONOTONIC, &spec);
-  return static_cast<uint32_t>(spec.tv_sec * 1000ULL + spec.tv_nsec / 1000000);
-}
-uint64_t millis_64() {
-  struct timespec spec;
-  clock_gettime(CLOCK_MONOTONIC, &spec);
-  return static_cast<uint64_t>(spec.tv_sec) * 1000ULL + static_cast<uint64_t>(spec.tv_nsec) / 1000000ULL;
-}
-void HOT delay(uint32_t ms) {
-  struct timespec ts;
-  ts.tv_sec = ms / 1000;
-  ts.tv_nsec = (ms % 1000) * 1000000;
-  int res;
-  do {
-    res = nanosleep(&ts, &ts);
-  } while (res != 0 && errno == EINTR);
-}
-uint32_t IRAM_ATTR HOT micros() {
-  struct timespec spec;
-  clock_gettime(CLOCK_MONOTONIC, &spec);
-  return static_cast<uint32_t>(spec.tv_sec * 1000000ULL + spec.tv_nsec / 1000);
-}
-void IRAM_ATTR HOT delayMicroseconds(uint32_t us) {
-  struct timespec ts;
-  ts.tv_sec = us / 1000000U;
-  ts.tv_nsec = (us % 1000000U) * 1000U;
-  int res;
-  do {
-    res = nanosleep(&ts, &ts);
-  } while (res != 0 && errno == EINTR);
-}
-void arch_restart() { exit(0); }
-void arch_init() {
-  // pass
-}
-void HOT arch_feed_wdt() {
-  // pass
-}
-
-uint32_t arch_get_cpu_cycle_count() {
-  struct timespec spec;
-  clock_gettime(CLOCK_MONOTONIC, &spec);
-  time_t seconds = spec.tv_sec;
-  uint32_t us = spec.tv_nsec;
-  return ((uint32_t) seconds) * 1000000000U + us;
-}
-uint32_t arch_get_cpu_freq_hz() { return 1000000000U; }
-
-}  // namespace esphome
+// HAL functions live in hal.cpp.
 
 void setup();
 void loop();
diff --git a/esphome/components/host/hal.cpp b/esphome/components/host/hal.cpp
new file mode 100644
index 0000000000..256a12ac62
--- /dev/null
+++ b/esphome/components/host/hal.cpp
@@ -0,0 +1,65 @@
+#ifdef USE_HOST
+
+#include "esphome/core/hal.h"
+#include "esphome/core/helpers.h"
+
+#include <time.h>
+#include <cerrno>
+#include <cstdlib>
+
+// Empty host namespace block to satisfy ci-custom's lint_namespace check.
+// HAL functions live in namespace esphome (root) — they are not part of the
+// host component's API.
+namespace esphome::host {}  // namespace esphome::host
+
+namespace esphome {
+
+// yield(), arch_init(), arch_feed_wdt(), arch_get_cpu_freq_hz() inlined in
+// core/hal/hal_host.h.
+
+uint32_t IRAM_ATTR HOT millis() {
+  struct timespec spec;
+  clock_gettime(CLOCK_MONOTONIC, &spec);
+  return static_cast<uint32_t>(spec.tv_sec * 1000ULL + spec.tv_nsec / 1000000);
+}
+uint64_t millis_64() {
+  struct timespec spec;
+  clock_gettime(CLOCK_MONOTONIC, &spec);
+  return static_cast<uint64_t>(spec.tv_sec) * 1000ULL + static_cast<uint64_t>(spec.tv_nsec) / 1000000ULL;
+}
+void HOT delay(uint32_t ms) {
+  struct timespec ts;
+  ts.tv_sec = ms / 1000;
+  ts.tv_nsec = (ms % 1000) * 1000000;
+  int res;
+  do {
+    res = nanosleep(&ts, &ts);
+  } while (res != 0 && errno == EINTR);
+}
+uint32_t IRAM_ATTR HOT micros() {
+  struct timespec spec;
+  clock_gettime(CLOCK_MONOTONIC, &spec);
+  return static_cast<uint32_t>(spec.tv_sec * 1000000ULL + spec.tv_nsec / 1000);
+}
+void IRAM_ATTR HOT delayMicroseconds(uint32_t us) {
+  struct timespec ts;
+  ts.tv_sec = us / 1000000U;
+  ts.tv_nsec = (us % 1000000U) * 1000U;
+  int res;
+  do {
+    res = nanosleep(&ts, &ts);
+  } while (res != 0 && errno == EINTR);
+}
+void arch_restart() { exit(0); }
+
+uint32_t arch_get_cpu_cycle_count() {
+  struct timespec spec;
+  clock_gettime(CLOCK_MONOTONIC, &spec);
+  time_t seconds = spec.tv_sec;
+  uint32_t ns = static_cast<uint32_t>(spec.tv_nsec);
+  return static_cast<uint32_t>(seconds) * 1000000000U + ns;
+}
+
+}  // namespace esphome
+
+#endif  // USE_HOST
diff --git a/esphome/components/libretiny/__init__.py b/esphome/components/libretiny/__init__.py
index 40b8c8dc6c..74ac51d200 100644
--- a/esphome/components/libretiny/__init__.py
+++ b/esphome/components/libretiny/__init__.py
@@ -37,6 +37,7 @@ from .const import (
     CONF_UART_PORT,
     FAMILIES,
     FAMILY_BK7231N,
+    FAMILY_BK7238,
     FAMILY_COMPONENT,
     FAMILY_FRIENDLY,
     FAMILY_RTL8710B,
@@ -56,19 +57,22 @@ CODEOWNERS = ["@kuba2k2"]
 AUTO_LOAD = ["preferences"]
 IS_TARGET_PLATFORM = True
 
-# BK7231N SDK options to disable unused features.
+# BLE 5.x BK SDK options to disable unused features.
 # Disabling BLE saves ~21KB RAM and ~200KB Flash because BLE init code is
 # called unconditionally by the SDK. ESPHome doesn't use BLE on LibreTiny.
 #
-# This only works on BK7231N (BLE 5.x). Other BK72XX chips using BLE 4.2
-# (BK7231T, BK7231Q, BK7251; BK7252 boards use the BK7251 family) have a bug
-# where the BLE library still links and references undefined symbols when
-# CFG_SUPPORT_BLE=0.
+# This only works on BLE 5.x BK chips (BK7231N, BK7238). Other BK72XX chips
+# using BLE 4.2 (BK7231T, BK7231Q, BK7251; BK7252 boards use the BK7251 family)
+# have a bug where the BLE library still links and references undefined symbols
+# when CFG_SUPPORT_BLE=0.
+#
+# On BK7238 the SDK also hangs at WiFi STA enable when BLE init runs, so
+# disabling it is required for reliable boot, not just an optimization.
 #
 # Other options like CFG_TX_EVM_TEST, CFG_RX_SENSITIVITY_TEST, CFG_SUPPORT_BKREG,
 # CFG_SUPPORT_OTA_HTTP, and CFG_USE_SPI_SLAVE were evaluated but provide no  # NOLINT
 # measurable benefit - the linker already strips unreferenced code via -gc-sections.
-_BK7231N_SYS_CONFIG_OPTIONS = [
+_BLE5_BK_SYS_CONFIG_OPTIONS = [
     "CFG_SUPPORT_BLE=0",
 ]
 
@@ -549,9 +553,9 @@ async def component_to_code(config):
         cg.add_platformio_option("custom_fw_version", __version__)
 
     # Apply chip-specific SDK options to save RAM/Flash
-    if config[CONF_FAMILY] == FAMILY_BK7231N:
+    if config[CONF_FAMILY] in (FAMILY_BK7231N, FAMILY_BK7238):
         cg.add_platformio_option(
-            "custom_options.sys_config#h", _BK7231N_SYS_CONFIG_OPTIONS
+            "custom_options.sys_config#h", _BLE5_BK_SYS_CONFIG_OPTIONS
         )
 
     # Tune lwIP for ESPHome's actual needs.
diff --git a/esphome/components/rp2040/core.cpp b/esphome/components/rp2040/core.cpp
index d3dc1cf2bb..11f23ccfef 100644
--- a/esphome/components/rp2040/core.cpp
+++ b/esphome/components/rp2040/core.cpp
@@ -1,41 +1,6 @@
 #ifdef USE_RP2040
 
-#include "core.h"
-#include "esphome/core/defines.h"
-#ifdef USE_RP2040_CRASH_HANDLER
-#include "crash_handler.h"
-#endif
-#include "esphome/core/hal.h"
-#include "esphome/core/helpers.h"
-
-#include "hardware/timer.h"
-#include "hardware/watchdog.h"
-
-namespace esphome {
-
-// yield(), delay(), micros(), millis(), millis_64() inlined in hal.h.
-void HOT delayMicroseconds(uint32_t us) { delay_microseconds_safe(us); }
-void arch_restart() {
-  watchdog_reboot(0, 0, 10);
-  while (1) {
-    continue;
-  }
-}
-
-void arch_init() {
-#ifdef USE_RP2040_CRASH_HANDLER
-  rp2040::crash_handler_read_and_clear();
-#endif
-#if USE_RP2040_WATCHDOG_TIMEOUT > 0
-  watchdog_enable(USE_RP2040_WATCHDOG_TIMEOUT, false);
-#endif
-}
-
-void HOT arch_feed_wdt() { watchdog_update(); }
-
-uint32_t HOT arch_get_cpu_cycle_count() { return ulMainGetRunTimeCounterValue(); }
-uint32_t arch_get_cpu_freq_hz() { return RP2040::f_cpu(); }
-
-}  // namespace esphome
+// HAL functions live in hal.cpp. core.cpp is intentionally empty for
+// rp2040 — there is no extra component bootstrap to keep here.
 
 #endif  // USE_RP2040
diff --git a/esphome/components/rp2040/hal.cpp b/esphome/components/rp2040/hal.cpp
new file mode 100644
index 0000000000..7475205d60
--- /dev/null
+++ b/esphome/components/rp2040/hal.cpp
@@ -0,0 +1,41 @@
+#ifdef USE_RP2040
+
+#include "core.h"
+#include "esphome/core/defines.h"
+#include "esphome/core/hal.h"
+#ifdef USE_RP2040_CRASH_HANDLER
+#include "crash_handler.h"
+#endif
+
+#include "hardware/watchdog.h"
+
+// Empty rp2040 namespace block to satisfy ci-custom's lint_namespace check.
+// HAL functions live in namespace esphome (root) — they are not part of the
+// rp2040 component's API.
+namespace esphome::rp2040 {}  // namespace esphome::rp2040
+
+namespace esphome {
+
+// yield(), delay(), micros(), millis(), millis_64(), delayMicroseconds(),
+// arch_feed_wdt(), arch_get_cpu_cycle_count() inlined in core/hal/hal_rp2040.h.
+void arch_restart() {
+  watchdog_reboot(0, 0, 10);
+  while (1) {
+    continue;
+  }
+}
+
+void arch_init() {
+#ifdef USE_RP2040_CRASH_HANDLER
+  rp2040::crash_handler_read_and_clear();
+#endif
+#if USE_RP2040_WATCHDOG_TIMEOUT > 0
+  watchdog_enable(USE_RP2040_WATCHDOG_TIMEOUT, false);
+#endif
+}
+
+uint32_t arch_get_cpu_freq_hz() { return RP2040::f_cpu(); }
+
+}  // namespace esphome
+
+#endif  // USE_RP2040
diff --git a/esphome/components/sendspin/__init__.py b/esphome/components/sendspin/__init__.py
index 58687ae838..1348bf2bfc 100644
--- a/esphome/components/sendspin/__init__.py
+++ b/esphome/components/sendspin/__init__.py
@@ -24,6 +24,7 @@ CONF_SENDSPIN_ID = "sendspin_id"
 
 CONF_INITIAL_STATIC_DELAY = "initial_static_delay"
 CONF_FIXED_DELAY = "fixed_delay"
+CONF_DECODE_MEMORY = "decode_memory"
 
 # sendspin-cpp library lives in the global `sendspin` namespace.
 sendspin_library_ns = cg.global_ns.namespace("sendspin")
@@ -39,6 +40,18 @@ CODEC_FORMAT_UNSUPPORTED = SendspinCodecFormat.enum("UNSUPPORTED")
 AudioSupportedFormatObject = sendspin_library_ns.struct("AudioSupportedFormatObject")
 PlayerRoleConfig = sendspin_library_ns.struct("PlayerRoleConfig")
 
+# MemoryLocation enum (from sendspin/types.h) controls SPIRAM-vs-internal-RAM placement
+# preference for the player role's transfer buffers.
+SendspinMemoryLocation = sendspin_library_ns.enum("MemoryLocation", is_class=True)
+
+MEMORY_PSRAM = "psram"
+MEMORY_INTERNAL = "internal"
+MEMORY_LOCATIONS = [MEMORY_PSRAM, MEMORY_INTERNAL]
+MEMORY_LOCATION_ENUM = {
+    MEMORY_PSRAM: SendspinMemoryLocation.PREFER_EXTERNAL,
+    MEMORY_INTERNAL: SendspinMemoryLocation.PREFER_INTERNAL,
+}
+
 # Trailing underscore avoids clashing with sendspin-cpp's global `sendspin` namespace.
 # Analysis tools strip the trailing underscore (same pattern as `template_`).
 sendspin_ns = cg.esphome_ns.namespace("sendspin_")
@@ -193,7 +206,7 @@ async def to_code(config: ConfigType) -> None:
         )
 
     # sendspin-cpp library
-    esp32.add_idf_component(name="sendspin/sendspin-cpp", ref="0.3.1")
+    esp32.add_idf_component(name="sendspin/sendspin-cpp", ref="0.4.0")
 
     cg.add_define("USE_SENDSPIN", True)  # for MDNS
 
@@ -249,14 +262,23 @@ async def to_code(config: ConfigType) -> None:
                 "CONFIG_SPIRAM_ALLOW_STACK_EXTERNAL_MEMORY", True
             )
 
-        player_config_struct = cg.StructInitializer(
-            PlayerRoleConfig,
+        # Library defaults: priority 18 (one above httpd_priority 17 so the decoder is not
+        # starved by the HTTP server during the initial encoded-audio burst at stream start),
+        # interpolation/decode buffer locations PREFER_EXTERNAL.
+        player_struct_fields = [
             ("audio_formats", audio_format_structs),
             ("audio_buffer_capacity", player_cfg[CONF_BUFFER_SIZE]),
             ("fixed_delay_us", player_cfg[CONF_FIXED_DELAY]),
             ("initial_static_delay_ms", player_cfg[CONF_INITIAL_STATIC_DELAY]),
             ("psram_stack", psram_stack),
-            ("priority", 2),
+        ]
+        if (decode_memory := player_cfg.get(CONF_DECODE_MEMORY)) is not None:
+            player_struct_fields.append(
+                ("decode_buffer_location", MEMORY_LOCATION_ENUM[decode_memory])
+            )
+        player_config_struct = cg.StructInitializer(
+            PlayerRoleConfig,
+            *player_struct_fields,
         )
         cg.add(var.set_player_config(player_config_struct))
     else:
diff --git a/esphome/components/sendspin/media_source/__init__.py b/esphome/components/sendspin/media_source/__init__.py
index 6d61a8a636..f689ab01cb 100644
--- a/esphome/components/sendspin/media_source/__init__.py
+++ b/esphome/components/sendspin/media_source/__init__.py
@@ -13,9 +13,11 @@ from esphome.cpp_generator import MockObj, TemplateArgsType
 from esphome.types import ConfigType
 
 from .. import (
+    CONF_DECODE_MEMORY,
     CONF_FIXED_DELAY,
     CONF_INITIAL_STATIC_DELAY,
     CONF_SENDSPIN_ID,
+    MEMORY_LOCATIONS,
     SendspinHub,
     _validate_task_stack_in_psram,
     register_player_config,
@@ -57,6 +59,7 @@ def _register(config: ConfigType) -> ConfigType:
             CONF_INITIAL_STATIC_DELAY: config[CONF_INITIAL_STATIC_DELAY],
             CONF_FIXED_DELAY: config[CONF_FIXED_DELAY],
             CONF_TASK_STACK_IN_PSRAM: config.get(CONF_TASK_STACK_IN_PSRAM, False),
+            CONF_DECODE_MEMORY: config.get(CONF_DECODE_MEMORY),
         }
     )
     return config
@@ -82,6 +85,7 @@ CONFIG_SCHEMA = cv.All(
             cv.Optional(CONF_SAMPLE_RATE, default=48000): cv.int_range(
                 min=16000, max=96000
             ),
+            cv.Optional(CONF_DECODE_MEMORY): cv.one_of(*MEMORY_LOCATIONS, lower=True),
         }
     ),
     cv.only_on_esp32,
diff --git a/esphome/components/zephyr/core.cpp b/esphome/components/zephyr/core.cpp
index 93a9a1ae8e..d1bdaee02d 100644
--- a/esphome/components/zephyr/core.cpp
+++ b/esphome/components/zephyr/core.cpp
@@ -1,8 +1,6 @@
 #ifdef USE_ZEPHYR
 
 #include <zephyr/kernel.h>
-#include <zephyr/drivers/watchdog.h>
-#include <zephyr/sys/reboot.h>
 #include <zephyr/random/random.h>
 #include "esphome/core/hal.h"
 #include "esphome/core/helpers.h"
@@ -10,55 +8,7 @@
 
 namespace esphome {
 
-#ifdef CONFIG_WATCHDOG
-static int wdt_channel_id = -1;  // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
-static const device *const WDT = DEVICE_DT_GET(DT_ALIAS(watchdog0));
-#endif
-
-void yield() { ::k_yield(); }
-uint32_t millis() { return static_cast<uint32_t>(millis_64()); }
-uint64_t millis_64() { return static_cast<uint64_t>(k_uptime_get()); }
-uint32_t micros() { return k_ticks_to_us_floor32(k_uptime_ticks()); }
-void delayMicroseconds(uint32_t us) { ::k_usleep(us); }
-void delay(uint32_t ms) { ::k_msleep(ms); }
-
-void arch_init() {
-#ifdef CONFIG_WATCHDOG
-  if (device_is_ready(WDT)) {
-    static wdt_timeout_cfg wdt_config{};
-    wdt_config.flags = WDT_FLAG_RESET_SOC;
-#ifdef USE_ZIGBEE
-    // zboss thread use a lot of cpu cycles during start
-    wdt_config.window.max = 10000;
-#else
-    wdt_config.window.max = 2000;
-#endif
-    wdt_channel_id = wdt_install_timeout(WDT, &wdt_config);
-    if (wdt_channel_id >= 0) {
-      uint8_t options = 0;
-#ifdef USE_DEBUG
-      options |= WDT_OPT_PAUSE_HALTED_BY_DBG;
-#endif
-#ifdef USE_DEEP_SLEEP
-      options |= WDT_OPT_PAUSE_IN_SLEEP;
-#endif
-      wdt_setup(WDT, options);
-    }
-  }
-#endif
-}
-
-void arch_feed_wdt() {
-#ifdef CONFIG_WATCHDOG
-  if (wdt_channel_id >= 0) {
-    wdt_feed(WDT, wdt_channel_id);
-  }
-#endif
-}
-
-void arch_restart() { sys_reboot(SYS_REBOOT_COLD); }
-uint32_t arch_get_cpu_cycle_count() { return k_cycle_get_32(); }
-uint32_t arch_get_cpu_freq_hz() { return sys_clock_hw_cycles_per_sec(); }
+// HAL functions live in hal.cpp.
 
 Mutex::Mutex() {
   auto *mutex = new k_mutex();
diff --git a/esphome/components/zephyr/hal.cpp b/esphome/components/zephyr/hal.cpp
new file mode 100644
index 0000000000..5c08ed2519
--- /dev/null
+++ b/esphome/components/zephyr/hal.cpp
@@ -0,0 +1,63 @@
+#ifdef USE_ZEPHYR
+
+#include "esphome/core/defines.h"
+#include "esphome/core/hal.h"
+
+#include <zephyr/drivers/watchdog.h>
+#include <zephyr/sys/reboot.h>
+
+// Empty zephyr namespace block to satisfy ci-custom's lint_namespace check.
+// HAL functions live in namespace esphome (root) — they are not part of the
+// zephyr component's API.
+namespace esphome::zephyr {}  // namespace esphome::zephyr
+
+namespace esphome {
+
+#ifdef CONFIG_WATCHDOG
+static int wdt_channel_id = -1;  // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
+static const device *const WDT = DEVICE_DT_GET(DT_ALIAS(watchdog0));
+#endif
+
+// yield(), delay(), micros(), millis(), millis_64(), delayMicroseconds(),
+// arch_get_cpu_cycle_count(), arch_get_cpu_freq_hz() inlined in
+// core/hal/hal_zephyr.h.
+
+void arch_init() {
+#ifdef CONFIG_WATCHDOG
+  if (device_is_ready(WDT)) {
+    static wdt_timeout_cfg wdt_config{};
+    wdt_config.flags = WDT_FLAG_RESET_SOC;
+#ifdef USE_ZIGBEE
+    // zboss thread uses a lot of CPU cycles during startup
+    wdt_config.window.max = 10000;
+#else
+    wdt_config.window.max = 2000;
+#endif
+    wdt_channel_id = wdt_install_timeout(WDT, &wdt_config);
+    if (wdt_channel_id >= 0) {
+      uint8_t options = 0;
+#ifdef USE_DEBUG
+      options |= WDT_OPT_PAUSE_HALTED_BY_DBG;
+#endif
+#ifdef USE_DEEP_SLEEP
+      options |= WDT_OPT_PAUSE_IN_SLEEP;
+#endif
+      wdt_setup(WDT, options);
+    }
+  }
+#endif
+}
+
+void arch_feed_wdt() {
+#ifdef CONFIG_WATCHDOG
+  if (wdt_channel_id >= 0) {
+    wdt_feed(WDT, wdt_channel_id);
+  }
+#endif
+}
+
+void arch_restart() { sys_reboot(SYS_REBOOT_COLD); }
+
+}  // namespace esphome
+
+#endif  // USE_ZEPHYR
diff --git a/esphome/components/zigbee/zigbee_esp32.py b/esphome/components/zigbee/zigbee_esp32.py
index 1b98df6c0a..9081582c7b 100644
--- a/esphome/components/zigbee/zigbee_esp32.py
+++ b/esphome/components/zigbee/zigbee_esp32.py
@@ -9,6 +9,7 @@ from esphome.components.esp32 import (
     add_idf_component,
     add_idf_sdkconfig_option,
     add_partition,
+    idf_version,
     require_vfs_select,
 )
 import esphome.config_validation as cv
@@ -186,6 +187,10 @@ async def _zigbee_add_sdkconfigs(config: ConfigType) -> None:
     # The pre-built Zigbee library uses esp_log_default_level which requires
     # dynamic log level control to be enabled
     add_idf_sdkconfig_option("CONFIG_LOG_DYNAMIC_LEVEL_CONTROL", True)
+    # The pre-built Zigbee library is compiled against newlib which requires newlib
+    # reentrancy to be enabled with picolibc compatibility.
+    if idf_version() >= cv.Version(6, 0, 0):
+        add_idf_sdkconfig_option("CONFIG_LIBC_PICOLIBC_NEWLIB_COMPATIBILITY", True)
 
 
 async def attributes_to_code(
diff --git a/esphome/core/hal/hal_host.h b/esphome/core/hal/hal_host.h
index a8896fdf63..d7f317176e 100644
--- a/esphome/core/hal/hal_host.h
+++ b/esphome/core/hal/hal_host.h
@@ -3,6 +3,7 @@
 #ifdef USE_HOST
 
 #include <cstdint>
+#include <sched.h>
 
 #define IRAM_ATTR
 #define PROGMEM
@@ -13,17 +14,18 @@ namespace esphome {
 /// Host has no ISR concept.
 __attribute__((always_inline)) inline bool in_isr_context() { return false; }
 
-void yield();
+__attribute__((always_inline)) inline void yield() { ::sched_yield(); }
+
 void delay(uint32_t ms);
 uint32_t micros();
 uint32_t millis();
 uint64_t millis_64();
-
 void delayMicroseconds(uint32_t us);  // NOLINT(readability-identifier-naming)
-void arch_feed_wdt();
 uint32_t arch_get_cpu_cycle_count();
-void arch_init();
-uint32_t arch_get_cpu_freq_hz();
+
+__attribute__((always_inline)) inline void arch_init() {}
+__attribute__((always_inline)) inline void arch_feed_wdt() {}
+__attribute__((always_inline)) inline uint32_t arch_get_cpu_freq_hz() { return 1000000000U; }
 
 }  // namespace esphome
 
diff --git a/esphome/core/hal/hal_rp2040.h b/esphome/core/hal/hal_rp2040.h
index 46f6e421cd..27a9b23c0b 100644
--- a/esphome/core/hal/hal_rp2040.h
+++ b/esphome/core/hal/hal_rp2040.h
@@ -20,8 +20,17 @@ extern "C" unsigned long millis(void);
 // Forward decl from <pico/time.h>.
 extern "C" uint64_t time_us_64(void);
 
+// Forward decls from pico-sdk / FreeRTOS port for the inline arch_*
+// wrappers below.
+extern "C" void watchdog_update(void);
+extern "C" unsigned long ulMainGetRunTimeCounterValue(void);
+
 namespace esphome {
 
+// Forward decl from helpers.h.
+// NOLINTNEXTLINE(readability-redundant-declaration)
+void delay_microseconds_safe(uint32_t us);
+
 /// Returns true when executing inside an interrupt handler.
 __attribute__((always_inline)) inline bool in_isr_context() {
   uint32_t ipsr;
@@ -35,9 +44,13 @@ __attribute__((always_inline)) inline uint32_t micros() { return static_cast<uin
 __attribute__((always_inline)) inline uint32_t millis() { return micros_to_millis(::time_us_64()); }
 __attribute__((always_inline)) inline uint64_t millis_64() { return micros_to_millis<uint64_t>(::time_us_64()); }
 
-void delayMicroseconds(uint32_t us);  // NOLINT(readability-identifier-naming)
-void arch_feed_wdt();
-uint32_t arch_get_cpu_cycle_count();
+// NOLINTNEXTLINE(readability-identifier-naming)
+__attribute__((always_inline)) inline void delayMicroseconds(uint32_t us) { delay_microseconds_safe(us); }
+__attribute__((always_inline)) inline void arch_feed_wdt() { watchdog_update(); }
+__attribute__((always_inline)) inline uint32_t arch_get_cpu_cycle_count() {
+  return static_cast<uint32_t>(ulMainGetRunTimeCounterValue());
+}
+
 void arch_init();
 uint32_t arch_get_cpu_freq_hz();
 
diff --git a/esphome/core/hal/hal_zephyr.h b/esphome/core/hal/hal_zephyr.h
index d4b37b5eb6..613b3911c1 100644
--- a/esphome/core/hal/hal_zephyr.h
+++ b/esphome/core/hal/hal_zephyr.h
@@ -4,6 +4,8 @@
 
 #include <cstdint>
 
+#include <zephyr/kernel.h>
+
 #define IRAM_ATTR
 #define PROGMEM
 
@@ -13,17 +15,19 @@ namespace esphome {
 /// Zephyr/nRF52: not currently consulted — wake path is platform-specific.
 __attribute__((always_inline)) inline bool in_isr_context() { return false; }
 
-void yield();
-void delay(uint32_t ms);
-uint32_t micros();
-uint32_t millis();
-uint64_t millis_64();
+__attribute__((always_inline)) inline void yield() { ::k_yield(); }
+__attribute__((always_inline)) inline void delay(uint32_t ms) { ::k_msleep(ms); }
+__attribute__((always_inline)) inline uint32_t micros() { return k_ticks_to_us_floor32(k_uptime_ticks()); }
+__attribute__((always_inline)) inline uint64_t millis_64() { return static_cast<uint64_t>(k_uptime_get()); }
+__attribute__((always_inline)) inline uint32_t millis() { return static_cast<uint32_t>(millis_64()); }
+
+// NOLINTNEXTLINE(readability-identifier-naming)
+__attribute__((always_inline)) inline void delayMicroseconds(uint32_t us) { ::k_usleep(us); }
+__attribute__((always_inline)) inline uint32_t arch_get_cpu_cycle_count() { return k_cycle_get_32(); }
+__attribute__((always_inline)) inline uint32_t arch_get_cpu_freq_hz() { return sys_clock_hw_cycles_per_sec(); }
 
-void delayMicroseconds(uint32_t us);  // NOLINT(readability-identifier-naming)
 void arch_feed_wdt();
-uint32_t arch_get_cpu_cycle_count();
 void arch_init();
-uint32_t arch_get_cpu_freq_hz();
 
 }  // namespace esphome
 
diff --git a/esphome/core/helpers.h b/esphome/core/helpers.h
index 355db6c7f4..07bcb7a74f 100644
--- a/esphome/core/helpers.h
+++ b/esphome/core/helpers.h
@@ -2045,7 +2045,8 @@ void delay_microseconds_safe(uint32_t us);
  * Returns `nullptr` in case no memory is available.
  *
  * By setting flags, it can be configured to:
- * - perform external allocation falling back to main memory if SPI RAM is full or unavailable
+ * - perform external allocation falling back to internal memory if SPI RAM is full or unavailable (default)
+ * - perform internal allocation falling back to external memory (with PREFER_INTERNAL)
  * - perform external allocation only
  * - perform internal allocation only
  */
@@ -2054,16 +2055,26 @@ template<class T> class RAMAllocator {
   using value_type = T;
 
   enum Flags {
-    NONE = 0,                 // Perform external allocation and fall back to internal memory
-    ALLOC_EXTERNAL = 1 << 0,  // Perform external allocation only.
-    ALLOC_INTERNAL = 1 << 1,  // Perform internal allocation only.
-    ALLOW_FAILURE = 1 << 2,   // Does nothing. Kept for compatibility.
+    NONE = 0,                  // Perform external allocation and fall back to internal memory
+    ALLOC_EXTERNAL = 1 << 0,   // Perform external allocation only.
+    ALLOC_INTERNAL = 1 << 1,   // Perform internal allocation only.
+    ALLOW_FAILURE = 1 << 2,    // Does nothing. Kept for compatibility.
+    PREFER_INTERNAL = 1 << 3,  // Perform internal allocation and fall back to external memory
   };
 
   constexpr RAMAllocator() = default;
-  constexpr RAMAllocator(uint8_t flags)
-      : flags_((flags & (ALLOC_INTERNAL | ALLOC_EXTERNAL)) != 0 ? (flags & (ALLOC_INTERNAL | ALLOC_EXTERNAL))
-                                                                : (ALLOC_INTERNAL | ALLOC_EXTERNAL)) {}
+  constexpr RAMAllocator(uint8_t flags) {
+    if (flags & PREFER_INTERNAL) {
+      this->flags_ = ALLOC_INTERNAL | ALLOC_EXTERNAL | PREFER_INTERNAL;
+      return;
+    }
+    const uint8_t alloc_bits = flags & (ALLOC_INTERNAL | ALLOC_EXTERNAL);
+    if (alloc_bits != 0) {
+      this->flags_ = alloc_bits;
+      return;
+    }
+    this->flags_ = ALLOC_INTERNAL | ALLOC_EXTERNAL;
+  }
   template<class U> constexpr RAMAllocator(const RAMAllocator<U> &other) : flags_{other.flags_} {}
 
   T *allocate(size_t n) { return this->allocate(n, sizeof(T)); }
@@ -2072,12 +2083,8 @@ template<class T> class RAMAllocator {
     size_t size = n * manual_size;
     T *ptr = nullptr;
 #ifdef USE_ESP32
-    if (this->flags_ & Flags::ALLOC_EXTERNAL) {
-      ptr = static_cast<T *>(heap_caps_malloc(size, MALLOC_CAP_SPIRAM | MALLOC_CAP_8BIT));
-    }
-    if (ptr == nullptr && this->flags_ & Flags::ALLOC_INTERNAL) {
-      ptr = static_cast<T *>(heap_caps_malloc(size, MALLOC_CAP_INTERNAL | MALLOC_CAP_8BIT));
-    }
+    const auto caps = this->get_caps_();
+    ptr = static_cast<T *>(heap_caps_malloc_prefer(size, 2, caps[0], caps[1]));
 #else
     // Ignore ALLOC_EXTERNAL/ALLOC_INTERNAL flags if external allocation is not supported
     ptr = static_cast<T *>(malloc(size));  // NOLINT(cppcoreguidelines-owning-memory,cppcoreguidelines-no-malloc)
@@ -2091,12 +2098,8 @@ template<class T> class RAMAllocator {
     size_t size = n * manual_size;
     T *ptr = nullptr;
 #ifdef USE_ESP32
-    if (this->flags_ & Flags::ALLOC_EXTERNAL) {
-      ptr = static_cast<T *>(heap_caps_realloc(p, size, MALLOC_CAP_SPIRAM | MALLOC_CAP_8BIT));
-    }
-    if (ptr == nullptr && this->flags_ & Flags::ALLOC_INTERNAL) {
-      ptr = static_cast<T *>(heap_caps_realloc(p, size, MALLOC_CAP_INTERNAL | MALLOC_CAP_8BIT));
-    }
+    const auto caps = this->get_caps_();
+    ptr = static_cast<T *>(heap_caps_realloc_prefer(p, size, 2, caps[0], caps[1]));
 #else
     // Ignore ALLOC_EXTERNAL/ALLOC_INTERNAL flags if external allocation is not supported
     ptr = static_cast<T *>(realloc(p, size));  // NOLINT(cppcoreguidelines-owning-memory,cppcoreguidelines-no-malloc)
@@ -2147,6 +2150,24 @@ template<class T> class RAMAllocator {
   }
 
  private:
+#ifdef USE_ESP32
+  /// Returns {primary_caps, fallback_caps} for heap_caps_*_prefer based on the configured flags.
+  /// PREFER_INTERNAL implies both regions are enabled (enforced by the constructor), so when it is set
+  /// the primary is internal and the fallback is external. Otherwise the primary is whichever region
+  /// is enabled (external preferred when both are enabled), and the fallback is the other region (or
+  /// the same region when only one is enabled, making the second attempt a no-op).
+  std::array<uint32_t, 2> get_caps_() const {
+    constexpr uint32_t external_caps = MALLOC_CAP_SPIRAM | MALLOC_CAP_8BIT;
+    constexpr uint32_t internal_caps = MALLOC_CAP_INTERNAL | MALLOC_CAP_8BIT;
+    if (this->flags_ & PREFER_INTERNAL) {
+      return {internal_caps, external_caps};
+    }
+    const uint32_t primary = (this->flags_ & ALLOC_EXTERNAL) ? external_caps : internal_caps;
+    const uint32_t fallback = (this->flags_ & ALLOC_INTERNAL) ? internal_caps : external_caps;
+    return {primary, fallback};
+  }
+#endif
+
   uint8_t flags_{ALLOC_INTERNAL | ALLOC_EXTERNAL};
 };
 
diff --git a/esphome/idf_component.yml b/esphome/idf_component.yml
index 757fcf9dd7..f5a8dd8c60 100644
--- a/esphome/idf_component.yml
+++ b/esphome/idf_component.yml
@@ -20,15 +20,19 @@ dependencies:
   espressif/mdns:
     version: 1.11.0
   espressif/esp_wifi_remote:
-    version: 1.4.0
+    version: 1.5.1
+    rules:
+      - if: "target in [esp32h2, esp32p4]"
+  espressif/wifi_remote_over_eppp:
+    version: 0.3.2
     rules:
       - if: "target in [esp32h2, esp32p4]"
   espressif/eppp_link:
-    version: 1.1.4
+    version: 1.1.5
     rules:
       - if: "target in [esp32h2, esp32p4]"
   espressif/esp_hosted:
-    version: 2.12.1
+    version: 2.12.6
     rules:
       - if: "target in [esp32h2, esp32p4]"
   zorxx/multipart-parser:
@@ -92,6 +96,6 @@ dependencies:
   esp32async/asynctcp:
     version: 3.4.91
   sendspin/sendspin-cpp:
-    version: 0.3.1
+    version: 0.4.0
   lvgl/lvgl:
     version: 9.5.0
diff --git a/script/determine-jobs.py b/script/determine-jobs.py
index 6fd7ab297c..c0cf8ecbdc 100755
--- a/script/determine-jobs.py
+++ b/script/determine-jobs.py
@@ -6,8 +6,7 @@ what files have changed. It outputs JSON with the following structure:
 
 {
   "integration_tests": true/false,
-  "integration_tests_run_all": true/false,
-  "integration_test_files": ["tests/integration/test_foo.py", ...],
+  "integration_test_buckets": [{"name": "1/3", "tests": ["tests/integration/test_foo.py", ...]}, ...],
   "clang_tidy": true/false,
   "clang_format": true/false,
   "python_linters": true/false,
@@ -81,6 +80,62 @@ CLANG_TIDY_SPLIT_THRESHOLD = 65
 # Isolated components count as 10x, groupable components count as 1x
 COMPONENT_TEST_BATCH_SIZE = 40
 
+# Integration test bucketing: when more than the threshold tests are scheduled,
+# fan out across this many parallel jobs. Below the threshold, a single job runs.
+INTEGRATION_TESTS_SPLIT_THRESHOLD = 10
+INTEGRATION_TESTS_SPLIT_BUCKETS = 3
+
+
+def _split_list(items: list[str], n: int) -> list[list[str]]:
+    """Split a list into n roughly-equal contiguous parts (matches script/clang-tidy)."""
+    k, m = divmod(len(items), n)
+    return [items[i * k + min(i, m) : (i + 1) * k + min(i + 1, m)] for i in range(n)]
+
+
+def _all_integration_test_files() -> list[str]:
+    """Return all integration test file paths, sorted, relative to repo root."""
+    return sorted(
+        str(p.relative_to(root_path))
+        for p in (Path(root_path) / "tests" / "integration").glob("test_*.py")
+    )
+
+
+def _compute_integration_test_buckets(
+    integration_run_all: bool,
+    integration_test_files: list[str],
+) -> tuple[bool, list[dict[str, Any]]]:
+    """Compute (run_integration, buckets) from the determine_integration_tests result.
+
+    Pure function for unit testing — no I/O beyond `_all_integration_test_files`
+    when `integration_run_all` is set.
+
+    `buckets` is a list of `{name, tests}` dicts where `tests` is a JSON-friendly
+    list of file paths so the workflow can build a bash array via jq, avoiding
+    shell word-splitting / glob hazards.
+    """
+    if integration_run_all:
+        files = _all_integration_test_files()
+    else:
+        files = sorted(integration_test_files)
+
+    # Empty list (e.g. run_all expansion with no files on disk) would otherwise
+    # cause the workflow to invoke pytest with no path argument and collect
+    # tests outside tests/integration/. Suppress the run instead.
+    if not files:
+        return False, []
+
+    if len(files) > INTEGRATION_TESTS_SPLIT_THRESHOLD:
+        parts = [
+            part for part in _split_list(files, INTEGRATION_TESTS_SPLIT_BUCKETS) if part
+        ]
+        buckets = [
+            {"name": f"{i + 1}/{len(parts)}", "tests": part}
+            for i, part in enumerate(parts)
+        ]
+    else:
+        buckets = [{"name": "1/1", "tests": files}]
+    return True, buckets
+
 
 class Platform(StrEnum):
     """Platform identifiers for memory impact analysis."""
@@ -812,7 +867,9 @@ def main() -> None:
     integration_run_all, integration_test_files = determine_integration_tests(
         args.branch
     )
-    run_integration = integration_run_all or bool(integration_test_files)
+    run_integration, integration_test_buckets = _compute_integration_test_buckets(
+        integration_run_all, integration_test_files
+    )
     run_clang_tidy = should_run_clang_tidy(args.branch)
     run_clang_format = should_run_clang_format(args.branch)
     run_python_linters = should_run_python_linters(args.branch)
@@ -944,8 +1001,7 @@ def main() -> None:
 
     output: dict[str, Any] = {
         "integration_tests": run_integration,
-        "integration_tests_run_all": integration_run_all,
-        "integration_test_files": integration_test_files,
+        "integration_test_buckets": integration_test_buckets,
         "clang_tidy": run_clang_tidy,
         "clang_tidy_mode": clang_tidy_mode,
         "clang_format": run_clang_format,
diff --git a/tests/components/sendspin/common-media_source.yaml b/tests/components/sendspin/common-media_source.yaml
index 4a7cd79c67..5b33a54647 100644
--- a/tests/components/sendspin/common-media_source.yaml
+++ b/tests/components/sendspin/common-media_source.yaml
@@ -7,3 +7,4 @@ media_source:
     initial_static_delay: 5ms
     static_delay_adjustable: true
     fixed_delay: 480us
+    decode_memory: internal
diff --git a/tests/script/test_determine_jobs.py b/tests/script/test_determine_jobs.py
index 44c110b689..e85f1757b0 100644
--- a/tests/script/test_determine_jobs.py
+++ b/tests/script/test_determine_jobs.py
@@ -122,10 +122,19 @@ def test_main_all_tests_should_run(
         "esphome/helpers.py",
     ]
 
+    # Stable, deterministic stand-in for the tests/integration/ glob so the
+    # bucket assertions don't drift with the real test count.
+    fake_test_files = [f"tests/integration/test_{i:03d}.py" for i in range(15)]
+
     # Run main function with mocked argv
     with (
         patch("sys.argv", ["determine-jobs.py"]),
         patch.object(determine_jobs, "_is_clang_tidy_full_scan", return_value=False),
+        patch.object(
+            determine_jobs,
+            "_all_integration_test_files",
+            return_value=fake_test_files,
+        ),
         patch.object(
             determine_jobs,
             "get_changed_components",
@@ -161,8 +170,24 @@ def test_main_all_tests_should_run(
     output = json.loads(captured.out)
 
     assert output["integration_tests"] is True
-    assert output["integration_tests_run_all"] is True
-    assert output["integration_test_files"] == []
+    # run_all=True expands to the full glob and pre-buckets into 3 parts.
+    # Each bucket's `tests` is a JSON list of file paths.
+    assert isinstance(output["integration_test_buckets"], list)
+    assert len(output["integration_test_buckets"]) == 3
+    assert [b["name"] for b in output["integration_test_buckets"]] == [
+        "1/3",
+        "2/3",
+        "3/3",
+    ]
+    for bucket in output["integration_test_buckets"]:
+        assert isinstance(bucket["tests"], list)
+        for path in bucket["tests"]:
+            assert isinstance(path, str)
+    bucket_files = [f for b in output["integration_test_buckets"] for f in b["tests"]]
+    assert bucket_files == fake_test_files
+    # Bucket sizes are balanced (max-min difference at most 1).
+    sizes = [len(b["tests"]) for b in output["integration_test_buckets"]]
+    assert max(sizes) - min(sizes) <= 1
     assert output["clang_tidy"] is True
     assert output["clang_tidy_mode"] in ["nosplit", "split"]
     assert output["clang_format"] is True
@@ -247,8 +272,7 @@ def test_main_no_tests_should_run(
     output = json.loads(captured.out)
 
     assert output["integration_tests"] is False
-    assert output["integration_tests_run_all"] is False
-    assert output["integration_test_files"] == []
+    assert output["integration_test_buckets"] == []
     assert output["clang_tidy"] is False
     assert output["clang_tidy_mode"] == "disabled"
     assert output["clang_format"] is False
@@ -332,8 +356,7 @@ def test_main_with_branch_argument(
     output = json.loads(captured.out)
 
     assert output["integration_tests"] is False
-    assert output["integration_tests_run_all"] is False
-    assert output["integration_test_files"] == []
+    assert output["integration_test_buckets"] == []
     assert output["clang_tidy"] is True
     assert output["clang_tidy_mode"] in ["nosplit", "split"]
     assert output["clang_format"] is False
@@ -357,6 +380,59 @@ def test_main_with_branch_argument(
     assert output["cpp_unit_tests_components"] == ["mqtt"]
 
 
+def test_compute_integration_test_buckets_empty() -> None:
+    """No integration tests scheduled => (False, [])."""
+    run, buckets = determine_jobs._compute_integration_test_buckets(False, [])
+    assert run is False
+    assert buckets == []
+
+
+def test_compute_integration_test_buckets_below_threshold() -> None:
+    """A small explicit list (<= threshold) => single 1/1 bucket with that list."""
+    files = [f"tests/integration/test_{name}.py" for name in ("c", "a", "b")]
+    run, buckets = determine_jobs._compute_integration_test_buckets(False, files)
+    assert run is True
+    assert buckets == [{"name": "1/1", "tests": sorted(files)}]
+
+
+def test_compute_integration_test_buckets_at_threshold_stays_single() -> None:
+    """Exactly INTEGRATION_TESTS_SPLIT_THRESHOLD files => still one bucket
+    (the split kicks in only when count is strictly greater than threshold)."""
+    files = [
+        f"tests/integration/test_{i:02d}.py"
+        for i in range(determine_jobs.INTEGRATION_TESTS_SPLIT_THRESHOLD)
+    ]
+    run, buckets = determine_jobs._compute_integration_test_buckets(False, files)
+    assert run is True
+    assert len(buckets) == 1
+    assert buckets[0]["name"] == "1/1"
+    assert buckets[0]["tests"] == sorted(files)
+
+
+def test_compute_integration_test_buckets_just_over_threshold_splits() -> None:
+    """One file over the threshold triggers the 3-bucket fan-out, balanced."""
+    n = determine_jobs.INTEGRATION_TESTS_SPLIT_THRESHOLD + 1
+    files = [f"tests/integration/test_{i:02d}.py" for i in range(n)]
+    run, buckets = determine_jobs._compute_integration_test_buckets(False, files)
+    assert run is True
+    assert [b["name"] for b in buckets] == ["1/3", "2/3", "3/3"]
+    union = [path for b in buckets for path in b["tests"]]
+    assert union == sorted(files)
+    sizes = [len(b["tests"]) for b in buckets]
+    assert max(sizes) - min(sizes) <= 1
+
+
+def test_compute_integration_test_buckets_run_all_with_empty_glob_disables_run() -> (
+    None
+):
+    """run_all=True but glob returns no files => run suppressed (otherwise
+    pytest would collect tests outside tests/integration/)."""
+    with patch.object(determine_jobs, "_all_integration_test_files", return_value=[]):
+        run, buckets = determine_jobs._compute_integration_test_buckets(True, [])
+    assert run is False
+    assert buckets == []
+
+
 def test_determine_integration_tests(
     monkeypatch: pytest.MonkeyPatch,
 ) -> None: