docs(integrity): xxHash3-64 checksum covers the payload only, not format (LAB-4212)

[27Bslash6]

Documents what the ByteStorage xxHash3-64 checksum actually covers: the uncompressed payload only. The envelope's format field sits outside the digest. Docs and comments only; no behaviour change.

• docs/features/rust-serialization.md › "xxHash3-64 Integrity": names the digest's input, states that format is outside it (a rotted format passes the checksum), and points to Deserialization failed in docs/error-codes.md for how AutoSerializer validates format instead.
• auto_serializer.py: two comments no longer call the envelope's format_id "verified"; they now say the checksum does not cover it, matching the deserialize docstring ("NEITHER copy is verified").
• tests/unit/test_auto_serializer_mutation_and_corruption.py: a class docstring reworded the same way.

Remaining hits of grep -rn -i -E "verified[^.]{0,20}format" src/cachekit/serializers/ tests/unit/test_auto_serializer_mutation_and_corruption.py:

• src/cachekit/serializers/auto_serializer.py:871 — "failed to decode inside a verified envelope (format=…)". "Verified" attaches to the envelope, whose payload passed the checksum. Accurate; kept.

make quick-check passes locally.

Closes LAB-4212

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• docs/features/rust-serialization.md
• src/cachekit/serializers/auto_serializer.py
• tests/unit/test_auto_serializer_mutation_and_corruption.py

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