The a2a invariant test skipped any synthesized token the canonical
redactor itself let through, so a boundary/shape regression would have
passed silently. Every class scrubs today, so the escape hatch goes and
the soft ">= 50" count becomes the exact registry size.
The gateway body test still asserted a "[REDACTED]" fallback marker that
no longer exists; redact_for_egress masks via _mask_token ("***"), so
assert that alone. honcho oauth.py's `re` import became unused when its
private pattern list moved to the registry.
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