fix: exempt parked review leaves from watchdog

[brickfrog]

Exempts lifecycle idle-watchdog states directly so merge-ready ReviewOwned leaves still emit the no-handoff escalation without being killed.\n\nVerification: moon test --target native && moon run src/bin/choir_lint --target native (pass).

Verification

Generated by Choir from commands executed in the leaf workspace.

• moon test --target native
  • exit: 0
  • head: 48a9421
  • output tail:

Warning: Main package `choir/src/bin/choir` uses blackbox-only test inputs (`_test.mbt` files) in package directory "/mnt/data/Code/choir/.choir/worktrees/rn3r-watchdog-exempt-parked-1781384290078-302538-0/src/bin/choir". Main packages will stop generating blackbox tests in a future release. Move public behavior into a non-main package and keep the main package as an entrypoint.
4
Total tests: 2018, passed: 2018, failed: 0.

• moon run src/bin/choir_lint --target native
  • exit: 0
  • head: 48a9421

[brickfrog]

Choir: GitHub Actions rollup reports all checks successful on the latest head — re-check review/merge policy on GitHub (not an approval or merge signal by itself).