feat: replace signature_format int with algo-prefixed ed25519: values

- Add encode_sig, encode_pubkey, decode_sig, decode_pubkey, sig_algo to _types.py - Remove signature_format field from CommitRecord, CommitDict, store serialization - Rewrite sign_commit_ed25519, verify_commit_ed25519, encode_public_key to use helpers - Update verify.py, verify_commit.py, verify_tag.py to dispatch on sig_algo prefix - Fix all tests to use helpers instead of raw base64 codec operations - Fix test helpers: strip sha256: prefix for filenames, store prefixed IDs in records

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muse/cli/commands/commit.py::import::PROVENANCE_PAYLOAD_VERSIONmuse/cli/commands/verify_commit.py::import::PROVENANCE_PAYLOAD_VERSIONmuse/cli/commands/verify_commit.py::import::base64muse/cli/commands/verify_tag.py::import::base64muse/core/provenance.py::import::base64muse/core/provenance.py::verify_commit_ed25519muse/core/store.py::CommitDictmuse/core/store.py::CommitRecord

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Branch task/sig-algo-prefix