feat: implement agent routes

[2witstudios]

Summary

• Add four agent interaction REST endpoints as a Fastify route plugin
• GET /api/agents/:id/logs?lines=N — capture tmux pane output (default 200 lines)
• POST /api/agents/:id/send — send text/keys to pane (raw, literal, with-enter modes)
• POST /api/agents/:id/kill — kill agent via core kill logic, update manifest
• POST /api/agents/:id/restart — restart with optional prompt override, spawns new agent
• Input validation on all POST routes with JSON schema
• PpgError codes mapped to HTTP statuses (404, 400, 409, 503)
• Server index bootstraps Fastify with CORS, optional bearer auth, and route registration
• Added serveStatePath and servePidPath to path helpers

Test plan

• 16 tests covering all four endpoints with mocked core functions
• Validates error responses (404 for unknown agents, 400 for bad input)
• Tests all three send modes (raw, literal, with-enter)
• Tests kill idempotency (already-stopped agents return success)
• Tests restart with both original prompt and prompt override
• Full test suite passes (234 tests)

Closes #69

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📥 Commits

Reviewing files that changed from the base of the PR and between 34deb69 and c3b197d.

⛔ Files ignored due to path filters (1)

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

📒 Files selected for processing (8)

• package.json
• src/commands/restart.ts
• src/commands/spawn.test.ts
• src/core/agent.ts
• src/lib/paths.ts
• src/server/index.ts
• src/server/routes/agents.test.ts
• src/server/routes/agents.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-69-agent-routes

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