feat: implement spawn route

[2witstudios]

Summary

• Add POST /api/spawn Fastify route plugin for creating worktrees and launching agents
• JSON Schema validation: name (required, non-empty), agent type, prompt/template (one required), base branch, count (1-20 integer), template vars
• Template variable rendering with {{VAR}} substitution (WORKTREE_PATH, BRANCH, AGENT_ID, PROJECT_ROOT, TASK_NAME, PROMPT, plus user vars)
• Returns 201 with worktree ID, name, branch, and agent details (IDs, tmux targets, session IDs)

Test plan

• 17 tests with mocked core modules covering:
  • Successful spawn with prompt and template
  • Multi-agent spawn (count > 1)
  • Template variable substitution
  • Agent type resolution
  • Base branch override and default
  • Schema validation (missing name, empty name, count bounds, non-integer count)
  • Manifest updates and env setup
  • tmux session creation

Closes #70

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📥 Commits

Reviewing files that changed from the base of the PR and between 34deb69 and 13f3a47.

📒 Files selected for processing (5)

• src/commands/spawn.test.ts
• src/commands/spawn.ts
• src/core/spawn.ts
• src/server/routes/spawn.test.ts
• src/server/routes/spawn.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-70-spawn-route

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