t27c: inline ; comment prose is tokenized -- "this test documents" mints a phantom TestBlock declaration

Parked under the 2026-10-05 own-language rule: the fix is in bootstrap/src/compiler.rs (hand-written Rust); it needs the owner's owner-approved-foreign label. This issue records the defect and the exact lead so the fix is a small, already-scoped change when it is unblocked.

Defect

t27c check on a spec whose inline comment prose contains the word test (or bench, fn, struct, enum) followed by an identifier reports a duplicate declaration for a block that does not exist. Repro from master specs/compiler/optimizer.t27 (#8502):

var result = true ; Placeholder for actual test implementation
...
then result == true ; This test documents the requirement - calls should be preserved

produces:

warning: `test implementation` is declared 2 times -- every backend rejects a redeclaration
warning: `test documents` is declared 2 times -- every backend rejects a redeclaration

Lab-verified both directions: reword only the comments -> 0 warnings; restore -> 2 warnings. The AST walk that reports it is honest (collect_top_level_decls, bootstrap/src/compiler.rs:25529, walks NodeKind::TestBlock children and reads child.name) -- the phantom TestBlock node already exists by then, so the token that minted it was produced upstream: inline ; comment text reaches the parser as tokens. Full-line comments are stripped (the corpus is full of them); the inline form after code on the same line is what leaks.

Why it matters

• A comment can break Spec Guards (it did: master red at 3d1a4fe, master: Spec Guards red -- optimizer.t27 phantom duplicate test names minted from comment prose #8580) without the spec declaring anything.
• A comment can collide with a REAL declaration and hide it in the same warning.
• The class is the repo's recorded one: prose that the compiler silently misreads (cf. the ;-alone-on-a-line trap that discards a module declaration).

Fix shape (for whoever unblocks it)

Strip ;-to-EOL in the tokenizer for the inline position too (or prove which layer keeps the text and strip there), add the optimizer comment shape as a fixture in bootstrap/tests/duplicate_declarations.rs asserting the phantom node is gone, and keep the prose-reading negative control (a comment MAY contain the word test; it must not mint a node).

Boundary

bootstrap/src/compiler.rs (tokenizer/comment handling)
bootstrap/tests/duplicate_declarations.rs