Fix multi-repo team worker spawn

[SuuBro]

Summary

• spawn host team workers from persisted multi-repo goal worktrees using exact local component HEADs
• launch from one branch container and retain per-repo cleanup metadata
• roll back only worktrees created by the current attempt and remove empty nested containers safely
• add focused real-Git direct and REST regression coverage

Validation

• focused multi-repo real-Git regression
• unchanged single-repo TeamManager spawn regression
• npm run check
• full implementation workflow: build, type-check, unit, browser, E2E, gap analysis, code-quality review, and bug hunt

🤖 Generated with Bobbit

[greptile-apps]

Greptile Summary

This PR fixes host multi-repository team-worker provisioning and cleanup.

• Creates component worktrees from each persisted goal worktree’s exact local HEAD.
• Persists per-repository cleanup metadata during initial session creation.
• Tracks branch ownership so rollback removes only branches created by the current attempt.
• Adds real-Git regression coverage and registers it in the test execution map.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failures remain.

Important Files Changed

Filename	Overview
src/server/agent/team-manager.ts	Spawns host multi-repository workers from exact component HEADs and threads ownership-aware cleanup metadata through session creation and team persistence.
src/server/skills/git.ts	Adds exact per-repository start points, branch-ownership tracking, partial rollback, and safe empty-container removal for worktree sets.
src/server/agent/session-manager.ts	Persists and consumes per-repository worktree coordinates for restoration, branch guarding, and purge cleanup.
src/server/agent/session-setup.ts	Carries multi-repository metadata through initial persistence and delegates failed pre-provisioned worker cleanup to TeamManager.
tests2/integration/team-spawn-multi-repo-real-git.test.ts	Adds direct and REST real-Git regression coverage for exact component starts, rollback, persistence, and cleanup.

Sequence Diagram

sequenceDiagram
  participant TM as TeamManager
  participant Git as createWorktreeSet
  participant SM as SessionManager
  participant Store as SessionStore
  TM->>TM: Read each goal component HEAD
  TM->>Git: Create worker component worktrees
  Git-->>TM: Container, paths, branch ownership
  TM->>SM: createSession with repoWorktrees
  SM->>Store: Persist initial cleanup metadata
  alt Session creation succeeds
    SM-->>TM: Worker session
  else Provisioning or session creation fails
    TM->>Git: Clean created worktrees and owned branches
    Git->>Git: Remove empty nested container
  end

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_{Reviews (2): Last reviewed commit: "test post-spawn multi-repo cleanup owner..." | Re-trigger Greptile}