Hoist the boolean spelling tables to helpers so cv.boolean and the env parser share one source

cv.boolean's inline tuples and the ccache env tables were two copies of
the same spellings; TRUTHY_BOOL_STRINGS/FALSY_BOOL_STRINGS now live in
esphome/helpers.py, cv.boolean consumes them, and parse_enable_env
derives its tables by adding the 1/0 env convention.

esphome/build_helpers/ccache.py

@@ -8,12 +8,13 @@ import os
 from pathlib import Path
 
 from esphome.framework_helpers import strip_win_long_path_prefix, tool_version_runs
+from esphome.helpers import FALSY_BOOL_STRINGS, TRUTHY_BOOL_STRINGS
 
 _LOGGER = logging.getLogger(__name__)
 
-# esphome cv.boolean's spelling tables plus the 1/0 env convention
-TRUTHY_ENV_STRINGS = frozenset({"1", "true", "yes", "on", "enable"})
-FALSY_ENV_STRINGS = frozenset({"0", "false", "no", "off", "disable"})
+# cv.boolean's spelling tables plus the 1/0 env convention
+TRUTHY_ENV_STRINGS = TRUTHY_BOOL_STRINGS | {"1"}
+FALSY_ENV_STRINGS = FALSY_BOOL_STRINGS | {"0"}
 
 
 def _ccache_runs(ccache: str) -> bool:

esphome/config_validation.py

@@ -93,7 +93,13 @@ from esphome.core import (
 )
 from esphome.enum import StrEnum
 from esphome.expression import SUBSTITUTION_VARIABLE_PROG as VARIABLE_PROG
-from esphome.helpers import add_class_to_obj, docs_url, list_starts_with
+from esphome.helpers import (
+    FALSY_BOOL_STRINGS,
+    TRUTHY_BOOL_STRINGS,
+    add_class_to_obj,
+    docs_url,
+    list_starts_with,
+)
 from esphome.schema_extractors import (
     SCHEMA_EXTRACT,
     schema_extractor,
@@ -581,9 +587,9 @@ def boolean(value):
         return value
     if isinstance(value, str):
         value = value.lower()
-        if value in ("true", "yes", "on", "enable"):
+        if value in TRUTHY_BOOL_STRINGS:
             return True
-        if value in ("false", "no", "off", "disable"):
+        if value in FALSY_BOOL_STRINGS:
             return False
     raise Invalid(
         f"Expected boolean value, but cannot convert {value} to a boolean. Please use 'true' or 'false'"

esphome/helpers.py

@@ -31,6 +31,11 @@ SockAddr = IPv4SockAddr | IPv6SockAddr
 
 _LOGGER = logging.getLogger(__name__)
 
+# cv.boolean's closed spelling tables; shared so env-knob parsers cannot
+# drift from what configs accept
+TRUTHY_BOOL_STRINGS = frozenset({"true", "yes", "on", "enable"})
+FALSY_BOOL_STRINGS = frozenset({"false", "no", "off", "disable"})
+
 IS_MACOS = platform.system() == "Darwin"
 IS_WINDOWS = platform.system() == "Windows"
 IS_LINUX = platform.system() == "Linux"