Revert to simple gt-mayor/gt-deacon session names

Reverts the session naming changes from PR #70. Multi-town support
on a single machine is not a real use case - rigs provide project
isolation, and true isolation should use containers/VMs.

Changes:
- MayorSessionName() and DeaconSessionName() no longer take townName parameter
- ParseSessionName() handles simple gt-mayor and gt-deacon formats
- Removed Town field from AgentIdentity and AgentSession structs
- Updated all callers and tests

Generated with Claude Code

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

internal/daemon/daemon.go

@@ -22,7 +22,6 @@ import (
 	"github.com/steveyegge/gastown/internal/polecat"
 	"github.com/steveyegge/gastown/internal/session"
 	"github.com/steveyegge/gastown/internal/tmux"
-	"github.com/steveyegge/gastown/internal/workspace"
 )
 
 // Daemon is the town-level background service.
@@ -198,13 +197,7 @@ const DeaconRole = "deacon"
 
 // getDeaconSessionName returns the Deacon session name for the daemon's town.
 func (d *Daemon) getDeaconSessionName() string {
-	townName, err := workspace.GetTownName(d.config.TownRoot)
-	if err != nil {
-		// Fallback to legacy name if town config can't be loaded
-		d.logger.Printf("Warning: failed to get town name: %v, using fallback", err)
-		return "gt-deacon"
-	}
-	return session.DeaconSessionName(townName)
+	return session.DeaconSessionName()
 }
 
 // ensureBootRunning spawns Boot to triage the Deacon.

internal/daemon/lifecycle.go

@@ -14,7 +14,6 @@ import (
 	"github.com/steveyegge/gastown/internal/constants"
 	"github.com/steveyegge/gastown/internal/session"
 	"github.com/steveyegge/gastown/internal/tmux"
-	"github.com/steveyegge/gastown/internal/workspace"
 )
 
 // BeadsMessage represents a message from gt mail inbox --json.
@@ -313,15 +312,9 @@ func (d *Daemon) identityToSession(identity string) string {
 	// Fallback: use default patterns based on role type
 	switch parsed.RoleType {
 	case "mayor":
-		if townName, err := workspace.GetTownName(d.config.TownRoot); err == nil {
-			return session.MayorSessionName(townName)
-		}
-		return ""
+		return session.MayorSessionName()
 	case "deacon":
-		if townName, err := workspace.GetTownName(d.config.TownRoot); err == nil {
-			return session.DeaconSessionName(townName)
-		}
-		return ""
+		return session.DeaconSessionName()
 	case "witness", "refinery":
 		return fmt.Sprintf("gt-%s-%s", parsed.RigName, parsed.RoleType)
 	case "crew":

internal/daemon/lifecycle_test.go

@@ -184,9 +184,10 @@ func TestIdentityToSession_Mayor(t *testing.T) {
 	d, cleanup := testDaemonWithTown(t, "ai")
 	defer cleanup()
 
+	// Mayor session name is now fixed (one per machine, no town qualifier)
 	result := d.identityToSession("mayor")
-	if result != "gt-ai-mayor" {
-		t.Errorf("identityToSession('mayor') = %q, expected 'gt-ai-mayor'", result)
+	if result != "gt-mayor" {
+		t.Errorf("identityToSession('mayor') = %q, expected 'gt-mayor'", result)
 	}
 }