PushResult has a singular `error: string | null` and a `refs` map — there
is no top-level `errors: string[]`. Replace the fabricated type and the
`errors`-based rejection guard with a correct PushResultRuntime type and a
belt-and-suspenders refsOk check. The real rejection path is a thrown
GitPushError (isomorphic-git throws, never returns, when a hook declines);
replace the single fiction-testing test with (a) a throw-path test that mocks
push to reject with a GitPushError and (b) a defensive non-throwing test that
mocks push to resolve { ok: false, error: 'unpack failed' }.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LKBbrAjmpVXMEK15pNi3Ha
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
