mode-functions writes without a parse check when a mode wrapper survives
holding api entries, since that intermediate state is unparseable until
move-api-blocks runs later in the same pass. Brace balance is the invariant
a bad splice offset would break, so check that instead; nothing downstream
could tell a corrupted wrapper from an untouched one.
Also records that Task 5's example-app migration ran against an already-
migrated target and so did not prove end-to-end behaviour.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
ClintchizandClaude Opus 5
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