fix(mayor): match handoff priming for gt may at startup (hq-osbot)

When starting Mayor via 'gt may at', the session now:
1. Works from townRoot (~/gt) instead of mayorDir (~/gt/mayor)
2. Includes startup beacon with explicit instructions in initial prompt
3. Removes redundant post-start nudges (beacon has instructions)

This matches the 'gt handoff' behavior where the agent immediately
knows to check hook and mail on startup.

Fixes: hq-h3449 (P0 escalation - horrendous starting UX)

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

Author: steveyegge

internal/mayor/manager.go

@@ -68,7 +68,7 @@ func (m *Manager) Start(agentOverride string) error {
 		}
 	}
 
-	// Ensure mayor directory exists
+	// Ensure mayor directory exists (for Claude settings)
 	mayorDir := m.mayorDir()
 	if err := os.MkdirAll(mayorDir, 0755); err != nil {
 		return fmt.Errorf("creating mayor directory: %w", err)
@@ -79,18 +79,25 @@ func (m *Manager) Start(agentOverride string) error {
 		return fmt.Errorf("ensuring Claude settings: %w", err)
 	}
 
-	// Build startup command first - the startup hook handles 'gt prime' automatically
+	// Build startup beacon with explicit instructions (matches gt handoff behavior)
+	// This ensures the agent has clear context immediately, not after nudges arrive
+	beacon := session.FormatStartupNudge(session.StartupNudgeConfig{
+		Recipient: "mayor",
+		Sender:    "human",
+		Topic:     "cold-start",
+	})
+
+	// Build startup command WITH the beacon prompt - the startup hook handles 'gt prime' automatically
 	// Export GT_ROLE and BD_ACTOR in the command since tmux SetEnvironment only affects new panes
-	startupCmd, err := config.BuildAgentStartupCommandWithAgentOverride("mayor", "mayor", "", "", agentOverride)
+	startupCmd, err := config.BuildAgentStartupCommandWithAgentOverride("mayor", "mayor", "", beacon, agentOverride)
 	if err != nil {
 		return fmt.Errorf("building startup command: %w", err)
 	}
 
-	// Create session with command directly to avoid send-keys race condition.
-	// This runs the command as the pane's initial process, avoiding the shell
-	// readiness timing issues that cause "bad pattern" and command-not-found errors.
+	// Create session in townRoot (not mayorDir) to match gt handoff behavior
+	// This ensures Mayor works from the town root where all tools work correctly
 	// See: https://github.com/anthropics/gastown/issues/280
-	if err := t.NewSessionWithCommand(sessionID, mayorDir, startupCmd); err != nil {
+	if err := t.NewSessionWithCommand(sessionID, m.townRoot, startupCmd); err != nil {
 		return fmt.Errorf("creating tmux session: %w", err)
 	}
 
@@ -119,18 +126,8 @@ func (m *Manager) Start(agentOverride string) error {
 
 	time.Sleep(constants.ShutdownNotifyDelay)
 
-	// Inject startup nudge for predecessor discovery via /resume
-	_ = session.StartupNudge(t, sessionID, session.StartupNudgeConfig{
-		Recipient: "mayor",
-		Sender:    "human",
-		Topic:     "cold-start",
-	}) // Non-fatal
-
-	// GUPP: Gas Town Universal Propulsion Principle
-	// Send the propulsion nudge to trigger autonomous coordination.
-	// Wait for beacon to be fully processed (needs to be separate prompt)
-	time.Sleep(2 * time.Second)
-	_ = t.NudgeSession(sessionID, session.PropulsionNudgeForRole("mayor", mayorDir)) // Non-fatal
+	// Startup beacon with instructions is now included in the initial command,
+	// so no separate nudge needed. The agent starts with full context immediately.
 
 	return nil
 }

internal/session/startup.go

@@ -65,9 +65,9 @@ func FormatStartupNudge(cfg StartupNudgeConfig) string {
 	beacon := fmt.Sprintf("[GAS TOWN] %s <- %s • %s • %s",
 		cfg.Recipient, cfg.Sender, timestamp, topic)
 
-	// For handoff, add explicit instructions so the agent knows what to do
+	// For handoff and cold-start, add explicit instructions so the agent knows what to do
 	// even if hooks haven't loaded CLAUDE.md yet
-	if cfg.Topic == "handoff" {
+	if cfg.Topic == "handoff" || cfg.Topic == "cold-start" {
 		beacon += "\n\nCheck your hook and mail, then act on the hook if present:\n" +
 			"1. `gt hook` - shows hooked work (if any)\n" +
 			"2. `gt mail inbox` - check for messages\n" +

internal/session/startup_test.go

@@ -41,6 +41,9 @@ func TestFormatStartupNudge(t *testing.T) {
 				"deacon",
 				"<- mayor",
 				"cold-start",
+				"Check your hook and mail", // cold-start includes explicit instructions (like handoff)
+				"gt hook",
+				"gt mail inbox",
 			},
 			// No wantNot - timestamp contains ":"
 		},