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What broke: a lane on a fresh `git init` repo had no working git surface.
`statusCounts` ran `rev-parse --short HEAD` unguarded, so `gitFacts` threw
and `GET /api/lanes/:id/git` answered `{available:false}` — the Changes
panel showed no header, and `commit`/`switch` 500'd through `isDirty`.
Add lane in Worktree mode accepted such a repo and left a `failed` row
behind, and a repo with commits but no remote had a permanently disabled
Push with no way to give it one short of a terminal.
What changed:
- worktree.js: an unborn HEAD is a normal state. `statusCounts` reports
`head: null`; `gitFacts` reads the branch via `symbolic-ref`, an empty
subject, and a new `unborn` field.
- git-ops.js: an 11th write, `publish` — `remote add origin -- <url>` then
`push -u origin HEAD`, only with a commit (ENOCOMMITS) and NO remote at
all (EREMOTEEXISTS, so it never re-points one), the url allowlisted by
`validateRemoteUrl` (https without userinfo, ssh://, scp-like; refuses
local paths, file://, ext::, fd::, git://, http://, leading `-`:
EBADURL), and `origin` removed again when the push fails.
- POST /api/lanes/worktree answers 400 EEMPTYREPO for a repo with no
commits instead of creating a row that can only fail.
- LaneGitBar: unborn repos show "no commits yet" and a commit-first hint;
no remote offers Publish… with an inline URL box; a remote but no
upstream relabels Push as "Publish branch". AddLaneModal disables Add
on an empty repo and offers "Use as a Repo lane".
- The two tests that used an unborn repo to force a provisioning failure
now use a `feat` ref clash, since that repo is refused up front.
- CLAUDE.md rule reworded to "the boring eleven" with publish's guards;
docs/API.md, docs/LANES.md, ARCHITECTURE.md, server/README.md, openapi.
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