review(cli): code review response for TUI defaults and positional path shortcuts

[Copilot]

Responding to @copilot review on the PR adding TUI defaults and positional CLI shortcuts. All CI checks pass (Tests ✅, Lint ✅, 127 tests).

Review findings

No blocking issues. Changes are correct, well-tested, and backward-compatible.

What looks good

• DEFAULT_METRICS_JSONL_FILENAME constant in metrics_stream.py is the right single source of truth for the worker↔TUI filename
• inject_cli_positional_paths and its private helpers are pure functions, easily testable in isolation
• sys.argv mutation in main() is properly guarded by finally restoration
• TUI status line now shows the resolved absolute path, removing ambiguity for custom --watch values
• Test coverage is solid across positional rewriting, dev e2e, TUI help output, and default-path resolution

Minor nits (non-blocking)

• inject_worker_positional_paths docstring says "backward-compatible alias" but both functions were introduced together; "public alias" is more accurate
• _QUICKSTART_EPILOG wording is slightly awkward — suggest condensing to:

  openrtc dev ./agents [./openrtc-metrics.jsonl] or use --agents-dir/--metrics-jsonl flags. start for production.

• _inject_worker_start_dev_console — the mixed-mode edge case (explicit --agents-dir + a bare second token) falls through to Typer's "unexpected argument" error; a short code comment would clarify this is intentional

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.14%. Comparing base (23224dc) to head (bb95383).
⚠️ Report is 3 commits behind head on cursor/tui-watch-path-handling-3694.

Additional details and impacted files

@@                         Coverage Diff                          @@
##           cursor/tui-watch-path-handling-3694      #24   +/-   ##
====================================================================
  Coverage                                90.14%   90.14%           
====================================================================
  Files                                       13       13           
  Lines                                     1420     1420           
====================================================================
  Hits                                      1280     1280           
  Misses                                     140      140           

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