The prefix-free structural check did its job finding the bug, but the table is
now verified against all 34 revisions in history and is effectively frozen --
it was guarding a constant. The StatLockInfo vector is a strict subset of the
all-symbols vector.
Keeps the one test covering the risk that's still live: a future rewrite of
Compress (hand-unrolled bit packing) silently corrupting the wire format. Pins
all 256 table entries plus the terminal code, and runs in ~10ms.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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