feat(statusline): link PRs from gh pr create to the session

[AnnatarHe]

Summary

Adds a PostToolUse hook (on('classic.PostToolUse')) to shelltime-statusline.

• When a Bash call runs gh pr create, the hook takes the PR URLs printed on stdout, including several from one chained command.
• It runs shelltime cc pr --session-id <session_id> <url>.... The CLI hands them to the ShellTime daemon, which saves them to the session on the server.
• It reads stdout only: gh reports an already existing PR on stderr, and that one wasn't opened here.
• It runs after next(e) and unawaited, so it never delays or changes the Bash result.
• It runs the CLI through $.process.run. The daemon's socket speaks raw JSON, and $.http.fetch({ socketPath }) only speaks HTTP, so the hook can't write to the socket directly.
• It tries ~/.shelltime/bin/shelltime first, then shelltime on PATH, because desktop hosts often lack ~/.shelltime/bin.
• Each URL is sent once per session. If the CLI can't be started, the URL is tried again the next time it is printed, and the failure goes to the debug log.
• The parsing helpers are pure functions in hooks/pullRequests.ts.
• The plugin README, root README and manifest descriptions now mention PR links. Release-please handles the version.

Depends on https://github.com/shelltime/server/pull/514 (the endpoint) and shelltime/cli#318 (shelltime cc pr plus the daemon message). Until a CLI release with cc pr is installed, nothing is linked and the statusline is unaffected.

Test plan

• hooks/pullRequests.test.ts (claude plugin test):
  • command and URL detection (GitHub Enterprise too, issues ignored)
  • two URLs linked in one run
  • repeats skipped, though another session still gets the same URL
  • gh pr view and non-Bash tools ignored
  • falls back to shelltime on PATH
  • retried after a failed run
• claude plugin validate --strict . and plugins/shelltime-statusline
• claude plugin test plugins/shelltime-statusline: 28 pass
• tsc against the engine's API types, then pnpm typecheck and pnpm test (31 pass)

🤖 Generated with Claude Code

https://claude.ai/code/session_01DVr1QVVUbfrjJSrsj9Nxc1

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