feat: Ed25519 manifest signing, commit uv.lock - #30
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The docstring promised Ed25519 but only HMAC-SHA256 with a shared secret existed — anyone holding the secret (every verifier) could forge signatures. Implement Ed25519 as an additive mode: - keygen subcommand generates an Ed25519 keypair (private PEM chmod 0600, public PEM safe to commit/pin) - sign/verify gain --ed25519; --key accepts literal PEM or a PEM file path - keys fall back to SKILLS_ED25519_PRIVATE_KEY / SKILLS_ED25519_PUBLIC_KEY env vars, mirroring how the HMAC secret is sourced from CI secrets - sign output now records its algorithm (hmac-sha256 or ed25519) - publish-registry workflow prefers Ed25519 when the SKILLS_ED25519_PRIVATE_KEY secret exists, else falls back to legacy HMAC so CI keeps working; making Ed25519 mandatory is a follow-up - fix the docstring to describe both schemes accurately - cryptography added to dependencies (lazy-imported, HMAC path stays stdlib-only) Legacy HMAC functions keep their signatures; existing tests unchanged.
The repo ships a Dockerfile and pyproject.toml, so dependency resolution should be pinned for reproducibility; uv.lock was listed under a 'Temporary' section of .gitignore and never committed. uv lock --check verifies the lockfile matches pyproject (including the new cryptography dependency).
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Remaining audit-sweep work on the fix branch after PR #29 merged: