* feat: add workspace project registration schema
* fix: satisfy workspace registration lint
* fix: harden workspace registration edge paths
- Reject linked-worktree and bare parents via validateWorkspaceParent before any mutation
- Roll back git init/.gitignore on failure in initWorkspaceParent so retries are clean
- Reject child repos named __root__ (reserved PK in session_worktrees)
- Serialise Service.Add with addMu to eliminate TOCTOU on concurrent same-path calls
- Fix ensureWorkspaceGitignore permission 0o600 -> 0o644
- Improve guardNoGitlinks suggestedFix with actionable git rm --cached guidance
- Remove dead CASE/__root__ ordering from ListWorkspaceRepos SQL (regenerated via sqlc)
- Resolve RepoOriginURL once per code path in Add (workspace vs single-repo)
- Add 7 tests covering the new edge paths
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