Add CommitFile/CommitSigner types + commitSigned to GitHost interface.
Implement git-push.ts (clone→add→commit({onSign=SSHSIG})→push over http/web)
and wire GiteaHost.commitSigned / GitHubHost.commitSigned. Tests: 7/7 incl.
golden-vector tie against the sshsig.test.ts byte-exact vector.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LKBbrAjmpVXMEK15pNi3Ha