gastown

feat(install): fold Dolt identity, HQ database, and server start into gt install (#1447)

fix(session): use hq- prefix for town-level dog and boot sessions

fix(beads): reject flag-like titles to prevent garbage bead creation (gt-e0kx5)

fix(hooks): use approve instead of allow for Stop hook decision

chore(ci): pin beads (bd) to v0.50.2 (#1443)