feat: implement status routes

[2witstudios]

Summary

• Adds Fastify-based read-only HTTP API routes for manifest data and live agent statuses
• GET /api/status — full manifest with refreshed agent statuses and computed lifecycle
• GET /api/worktrees/:id — single worktree detail (resolves by ID or name)
• GET /api/worktrees/:id/diff — branch diff in numstat format (file-level additions/deletions)
• All routes authenticated via Bearer token
• Routes registered as a Fastify plugin accepting projectRoot and bearerToken options

Closes #68

Test plan

• 13 tests using Fastify inject() with mocked core functions
• Auth: missing token → 401, wrong token → 401, valid token → 200
• Status: returns manifest with lifecycle, calls refreshAllAgentStatuses
• Worktree detail: valid ID → 200 with lifecycle, unknown → 404
• Diff: numstat parsing, empty diff, binary files, correct git range, unknown worktree → 404
• Full test suite passes (231 tests, 22 files)
• Typecheck passes (no errors in new files)

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📥 Commits

Reviewing files that changed from the base of the PR and between 34deb69 and 7c1a319.

⛔ Files ignored due to path filters (1)

• package-lock.json is excluded by !**/package-lock.json

📒 Files selected for processing (6)

• package.json
• src/commands/spawn.test.ts
• src/commands/status.ts
• src/core/lifecycle.ts
• src/server/routes/status.test.ts
• src/server/routes/status.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch ppg/issue-68-status-routes

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