A component's group is wrapped in a single IIFE with no sub-splitting when its to_code emits any of: scope-brace RawStatement, direct RawExpression via cg.add (raw bare-local or field-assignment like 'tz.field = x'), or typed AssignmentExpression (cg.variable). Detection is content-aware so entity_helpers' inline-comment RawStatements and RawExpression-as-CallExpression-arg don't false-positive. Adds 4 regression tests covering each detection path and the non-triggering inverse cases.