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Implements the manifest surface for the signed-commits & audit-attribution PRD (#423, PR #480): a bottle opts into per-activation commit signing with git-gate: signing: enabled: true - New ManifestGitSigning value type (frozen, enabled: bool = False) parsed under git-gate.signing; unknown sub-keys and non-bool `enabled` die with targeted errors. parse_git_gate_config now returns (repos, user, signing). - ManifestBottle gains git_signing; defaults to off, so bottles that omit the block are unchanged. - Bottle-only: git-gate.signing on an agent is rejected by the existing agent-level non-`user` guard (like git-gate.repos). - extends/runtime merges thread git_signing with an enable-wins overlay (a child enabling signing wins; omitting inherits the parent), mirroring the git_user non-empty-wins overlay. - Facade exports ManifestGitSigning. Tests: tests/unit/test_manifest_git_signing.py (parse, validation, agent-level rejection, extends overlay). Full unit suite green. This is the first stacked chunk; signing pipeline, gate signature check, and control-plane verification + audit tables follow per the PRD. Issue: #423 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>