feat(beads): Add hq- prefix helpers for town-level beads (gt-y24km, gt-qgmyz)

Phase 1: Create agent_ids.go with town-level bead ID helpers
- MayorBeadIDTown(), DeaconBeadIDTown(), DogBeadIDTown()
- RoleBeadIDTown() and role-specific helpers (hq-*-role)
- Add deprecation notices to old gt-* prefix functions

Phase 2: Create town-level agent beads during gt install
- initTownAgentBeads() creates hq-mayor, hq-deacon agent beads
- Creates role beads: hq-mayor-role, hq-deacon-role, etc.
- Update rig/manager.go to use rig beads for Witness/Refinery

This aligns with the two-level beads architecture:
- Town beads (~/gt/.beads/): hq-* prefix for Mayor, Deacon, roles
- Rig beads (<rig>/.beads/): <prefix>-* for Witness, Refinery, Polecats

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

internal/beads/agent_ids.go

@@ -50,3 +50,23 @@ func DeaconRoleBeadIDTown() string {
 func DogRoleBeadIDTown() string {
 	return RoleBeadIDTown("dog")
 }
+
+// WitnessRoleBeadIDTown returns the Witness role bead ID for town-level storage.
+func WitnessRoleBeadIDTown() string {
+	return RoleBeadIDTown("witness")
+}
+
+// RefineryRoleBeadIDTown returns the Refinery role bead ID for town-level storage.
+func RefineryRoleBeadIDTown() string {
+	return RoleBeadIDTown("refinery")
+}
+
+// PolecatRoleBeadIDTown returns the Polecat role bead ID for town-level storage.
+func PolecatRoleBeadIDTown() string {
+	return RoleBeadIDTown("polecat")
+}
+
+// CrewRoleBeadIDTown returns the Crew role bead ID for town-level storage.
+func CrewRoleBeadIDTown() string {
+	return RoleBeadIDTown("crew")
+}

internal/beads/beads.go

@@ -1188,6 +1188,8 @@ func DeaconBeadID() string {
 
 // DogBeadID returns a Dog agent bead ID.
 // Dogs are town-level agents, so they follow the pattern: gt-dog-<name>
+// Deprecated: Use DogBeadIDTown() for town-level beads with hq- prefix.
+// Dogs are town-level agents and should use hq-dog-<name>, not gt-dog-<name>.
 func DogBeadID(name string) string {
 	return "gt-dog-" + name
 }
@@ -1398,6 +1400,8 @@ func IsAgentSessionBead(beadID string) bool {
 
 // RoleBeadID returns the role bead ID for a given role type.
 // Role beads define lifecycle configuration for each agent type.
+// Deprecated: Use RoleBeadIDTown() for town-level beads with hq- prefix.
+// Role beads are global templates and should use hq-<role>-role, not gt-<role>-role.
 func RoleBeadID(roleType string) string {
 	return "gt-" + roleType + "-role"
 }