Port Gas Town to use Google Gemini CLI

feat(doctor): add rig identity beads check

fix: SetupRedirect now works with tracked beads architecture

feat(deacon): implement bulletproof pause mechanism (gt-bpo2c) (#265)

feat(account): add gt account switch command

fix(install): update placeholder comment to reference gt-4ke5e

docs: add Context Management section to Witness template (gt-jjama)

fix: derive gt- prefix for gastown compound words (gt-m46bb)

fix: restore agent override support lost in manager refactors

feat: Add rig-level custom agent support (#12)

refactor: replace ensureRefinerySession with refinery.Manager.Start()

Fix CI: enable beads custom types during install

docs: design Dog pool architecture for concurrent shutdown dances (gt-fsld8)

fix(formula): remove kill authority from Deacon patrol (gt-vhaej)

fix(tmux): wait for shell ready before sending keys (#264)