Commit/rebase via PTY relay

[recrsn]

Summary

Stacked on #17 (refactor/agents-router-factory)

Commit via PTY

POST /agents/:id/commit now sends a natural-language prompt to the running agent via PTY instead of calling git commit directly. If the agent is not running it is respawned first so it can receive the instruction. This means the agent decides the commit message and can handle staged/unstaged state itself.

Rebase conflict relay

When a rebase conflict occurs and the agent is running, the backend sends a conflict-resolution prompt via PTY and returns resolving: true. The frontend now uses result.resolving instead of checking agent.status === "running" locally, moving the detection server-side.

Merge button gated on commits ahead

• DiffResult gains aheadCount (computed via rev-list --count merge-base..HEAD)
• Merge button is visible whenever aheadCount > 0, regardless of ticket status
• Previously required ticket.status === "review", which was never reached when the agent keeps running after committing via PTY

Kill → Restart

The KILL button is replaced by RESTART, wiring up the restart endpoint from #17.

Test plan

• Click COMMIT with a running agent; confirm agent receives the prompt and commits
• Click COMMIT with a stopped agent; confirm agent is respawned and receives the prompt
• Trigger a rebase conflict on a running agent; confirm agent receives the conflict message
• Make commits in a worktree; confirm MERGE button appears without needing to move ticket to review

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 3ae5c443-d070-4516-a393-0abd4ccb9108

📥 Commits

Reviewing files that changed from the base of the PR and between 3253856 and dd86bc6.

📒 Files selected for processing (5)

• src/backend/routes/agents.ts
• src/backend/services/GitWorktreeManager.ts
• src/common/types.ts
• src/frontend/components/AgentDetailPanel.tsx
• src/frontend/lib/api.ts

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