feat: Add pu watch — live terminal dashboard

[2witstudios]

Summary

• Adds pu watch command — a live-updating terminal dashboard that shows all agents across all worktrees in real-time
• Animated braille spinners for streaming agents, color-coded status (streaming/waiting/done/broken/suspended), elapsed time, and prompt previews
• Summary bar with agent counts, auto-refresh every 800ms (configurable via --interval), clean Ctrl+C exit using alternate screen buffer

What it looks like

 pu watch 14:32:07

 3 agents  2 streaming  1 waiting  0 done  0 broken

 fix-auth pu/fix-auth Active
   ⠹ ag-abc12345   claude       streaming  2m14s    fix the authentication bug…
   ● ag-def67890   codex        waiting    45s      review the PR changes…

 Root agents
   ⠼ ag-ghi11111   claude       streaming  12m3s    monitor CI pipeline…

Implementation

• crates/pu-cli/src/commands/watch.rs — polls daemon status, renders ANSI dashboard with owo-colors
• Uses ctrlc crate for graceful Ctrl+C handling + alternate screen buffer (\x1b[?1049h)
• 9 unit tests covering elapsed time formatting and agent counting logic
• Zero clippy warnings, all 79 existing tests continue to pass

Test plan

• cargo clippy --package pu-cli — 0 warnings
• cargo test --package pu-cli — 79/79 pass
• Manual: pu watch with active agents shows live dashboard
• Manual: pu watch --interval 2000 refreshes at 2s intervals
• Manual: Ctrl+C exits cleanly, restores terminal

🤖 Generated with Claude Code

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⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 2f8f9e47-1846-45a6-82bd-7a143bad5dca

📥 Commits

Reviewing files that changed from the base of the PR and between 55aa882 and 64f070d.

⛔ Files ignored due to path filters (1)

• Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (4)

• crates/pu-cli/Cargo.toml
• crates/pu-cli/src/commands/mod.rs
• crates/pu-cli/src/commands/watch.rs
• crates/pu-cli/src/main.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-4

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