master: Spec Guards red -- optimizer.t27 phantom duplicate test names minted from comment prose

Does any spec declare one name twice fails on master (3d1a4fe) with:

NEW: specs/compiler/optimizer.t27 declares 2 name(s) twice and is not in the baseline
warning: `test implementation` is declared 2 times -- every backend rejects a redeclaration
warning: `test documents` is declared 2 times -- every backend rejects a redeclaration

The two "duplicates" are not declarations. #8502's census tests carry inline ; comments whose PROSE contains the word test followed by an identifier:

• var result = true ; Placeholder for actual test implementation (twice)
• then result == true ; This test documents the requirement - ... (twice)

and t27c's check counts each phrase as a TestBlock named implementation / documents (see duplicate_top_level_decls -> collect_top_level_decls, bootstrap/src/compiler.rs:25529). Lab-proven by rewording only the comments: t27c check goes from 2 warnings to 0 with the spec bodies untouched.

Fix here (this issue): reword the four comment phrases so no prose contains test <identifier>; reseal the optimizer twins (the spec hash moves). The compiler-side root cause -- inline comment text being tokenized at all -- is #8581, parked under the foreign-code rule.

Refs #6063 (steward lane; found while clearing the Spec Guards stack after #8564).