feat: Add pu recap command

[2witstudios]

Summary

• Adds pu recap — a new CLI command that answers "what happened while I was away?" by combining agent status with git diff stats into a single structured view
• Full protocol plumbing: Request::Recap / Response::RecapResult with RecapWorktreeEntry and RecapAgentEntry data structures
• Rich terminal output: status icons (● streaming, ◆ waiting, ✓ done, ✗ broken), duration formatting, prompt preview, diff stats with color-coded +/- counts, and an aggregate summary line

Example output

━━━ Workspace Recap ━━━

  ✓ feature-auth (ag-a1b2) done 12m
    4 file(s), +127, -23
    "Add user authentication middleware"

  ● refactor-db (ag-e5f6) streaming 45m
    7 file(s), +342, -89
    "Refactor database connection pooling"

  1 done, 1 streaming · 11 file(s) · +469, -112

Test plan

• All 425 existing + new tests pass (cargo test — 0 failures)
• Clippy clean (cargo clippy — 0 warnings)
• Pre-commit hooks pass (formatting + hygiene)
• Manual test: pu recap with active workspace agents
• Manual test: pu recap --json produces valid JSON

🤖 Generated with Claude Code

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⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 14708dc2-f290-4e64-b06d-bc0f57ce36ab

📥 Commits

Reviewing files that changed from the base of the PR and between 55aa882 and e48ea7d.

📒 Files selected for processing (6)

• crates/pu-cli/src/commands/mod.rs
• crates/pu-cli/src/commands/recap.rs
• crates/pu-cli/src/main.rs
• crates/pu-cli/src/output.rs
• crates/pu-core/src/protocol.rs
• crates/pu-engine/src/engine.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch pu/feature-2

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