feat: ML-DSA-65, did:key, named hash algorithm, model provenance, log tiles and witnesses

- hashing.algorithm names the hash function in every document; a consumer refuses one it does not implement (doc.hash.algorithm)
- ML-DSA-65 (FIPS 204) is an implemented signature scheme: pure-Python reference in tools/oracle/mldsa.py checked against NIST ACVP vectors, a receipt signed by the new roster key dana, and signature vectors for key generation and a deterministic signature
- roster keys may carry a did:key, which the validator checks against the public key (doc.roster.did), and a witness purpose for parties that cosign log checkpoints
- model provenance: a correction's author and an annotation's generator name the model with provider, version and the hashes of its weights, prompt and parameters, and where it ran
- the transparency log gains the tlog-tiles static layout (fixtures/records/log/), a project settings.log with origin, witnesses and threshold, and an acceptance rule; the fixture checkpoint is cosigned by a witness
- store.sql: roster_keys accepts cose and ml-dsa-65 and gains a did column
- spec chapters 01, 08, 11, 18, 20 and 23, the rationale, glossary, fixture, vector and tool guides updated; stress harness covers ML-DSA

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

vectors/checkpoint.jsonl

@@ -1 +1 @@
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+{"entries":[["receipt","npc15pn6675z5","37b3025b54c6397e5f8d400912b5788cd6ce203059cd9143e7d521c2cdbf2917"],["receipt","y2zw8ctg5s8dp","ae17f8866a05ca1b671d96b7758984e11ac694acd6743835f107cb513c7cc600"],["receipt","mvjmb94nz7rdh","a4dca8b492bf3e1b190f22e09de77713523e345526fd1b01c1186d0fe80d1cf4"],["receipt","q465jpwz8afhe","39218b2b73e853e2e66d8d4ce68cf7e155ca001f05ee4da5942a8d9b63b216bc"],["revocation","pcbhtpwvysgq6","9062e3ab737ecc2e6d487d2076ee27f764be60f06ad01f1ad103d708d466e56a"],["receipt","gx2s84z9jf9xv","5ee8b2827d327a7bbcacb08fd19b9523fad83ebf6c29350d5ce7ca30bf5ce388"],["receipt","mg18668nzxvap","4c80506322bfeed5649cfab303959e4ccf0aa0e594995ee6fd5ad59f9d3ee6a7"],["receipt","yt70fcc3qm0xb","2ad1c0f63077a03ab1cce01e6235734577d0b072b90ebab2f7db7fd481ccee2c"],["roster","smithlab","782c5e68f4e4f9918e69b7a44b108d9d70c89a289981acff3d25300ec8373c15"]],"id":"smithlab","note":"scient.ing/log/smithlab\n9\nGa0n103p3Gl136z6XWmM92kGvsvMYGXlk+ijjX4KWiA=\n\n— ana dBv7wtCAdNnczkCO5KwtrmDvtWUVPRusBSuLPeBDQoLZi9Hm34IHuNjvnjyPEar5afNf7xqcDtokk2XZEP31uJMVuwE=\n— wit h7ghDsJGkhWLaPO7+TIZQUenslhiQh/E/TKWU4ddphpFcuylQBZM2kG/o8H1nyPfUT0MkbvnFqPFfHPH3OaN5W1EwAI=\n","origin":"scient.ing/log/smithlab","root":"19ad27d74de9dc6975dfacfa5d698cf76906becbcc6065e593e8a38d7e0a5a20","signers":["ana","wit"],"tiles":["tile/0/000.p/9","tile/entries/000.p/9"]}