Unify agent startup with GUPP propulsion nudge

Witness and Refinery startup was duplicated across cmd/witness.go, cmd/up.go,
cmd/rig.go, and daemon.go. Worse, not all code paths sent the propulsion nudge
(GUPP - Gas Town Universal Propulsion Principle). Now unified in Manager.Start()
which handles everything including nudges.

Changes:
- witness/manager.go: Full rewrite with session creation, env vars, theming,
  WaitForClaudeReady, startup nudge, and propulsion nudge (GUPP)
- refinery/manager.go: Add propulsion nudge sequence after Claude startup
- cmd/witness.go: Simplify to just call mgr.Start(), remove ensureWitnessSession
- cmd/rig.go: Use witness.Manager.Start() instead of inline session creation
- cmd/start.go: Use witness.Manager.Start()
- cmd/up.go: Use witness.Manager.Start(), remove ensureWitness(),
  add EnsureSettingsForRole in ensureSession()
- daemon.go: Use witness.Manager.Start() and refinery.Manager.Start() for
  unified startup with proper nudges

This ensures all agent startup paths (gt witness start, gt rig boot, gt up,
daemon restarts) consistently apply GUPP propulsion nudges.

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

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

internal/cmd/up.go

@@ -10,6 +10,7 @@ import (
 
 	"github.com/spf13/cobra"
 	"github.com/steveyegge/gastown/internal/beads"
+	"github.com/steveyegge/gastown/internal/claude"
 	"github.com/steveyegge/gastown/internal/config"
 	"github.com/steveyegge/gastown/internal/constants"
 	"github.com/steveyegge/gastown/internal/daemon"
@@ -18,6 +19,7 @@ import (
 	"github.com/steveyegge/gastown/internal/session"
 	"github.com/steveyegge/gastown/internal/style"
 	"github.com/steveyegge/gastown/internal/tmux"
+	"github.com/steveyegge/gastown/internal/witness"
 	"github.com/steveyegge/gastown/internal/workspace"
 )
 
@@ -103,11 +105,22 @@ func runUp(cmd *cobra.Command, args []string) error {
 	rigs := discoverRigs(townRoot)
 	for _, rigName := range rigs {
 		sessionName := fmt.Sprintf("gt-%s-witness", rigName)
-		rigPath := filepath.Join(townRoot, rigName)
 
-		if err := ensureWitness(t, sessionName, rigPath, rigName); err != nil {
+		_, r, err := getRig(rigName)
+		if err != nil {
 			printStatus(fmt.Sprintf("Witness (%s)", rigName), false, err.Error())
 			allOK = false
+			continue
+		}
+
+		mgr := witness.NewManager(r)
+		if err := mgr.Start(false); err != nil {
+			if err == witness.ErrAlreadyRunning {
+				printStatus(fmt.Sprintf("Witness (%s)", rigName), true, sessionName)
+			} else {
+				printStatus(fmt.Sprintf("Witness (%s)", rigName), false, err.Error())
+				allOK = false
+			}
 		} else {
 			printStatus(fmt.Sprintf("Witness (%s)", rigName), true, sessionName)
 		}
@@ -244,6 +257,11 @@ func ensureSession(t *tmux.Tmux, sessionName, workDir, role string) error {
 		return nil
 	}
 
+	// Ensure Claude settings exist
+	if err := claude.EnsureSettingsForRole(workDir, role); err != nil {
+		return fmt.Errorf("ensuring Claude settings: %w", err)
+	}
+
 	// Create session
 	if err := t.NewSession(sessionName, workDir); err != nil {
 		return err
@@ -302,59 +320,6 @@ func ensureSession(t *tmux.Tmux, sessionName, workDir, role string) error {
 	return nil
 }
 
-// ensureWitness starts a witness session for a rig.
-func ensureWitness(t *tmux.Tmux, sessionName, rigPath, rigName string) error {
-	running, err := t.HasSession(sessionName)
-	if err != nil {
-		return err
-	}
-	if running {
-		return nil
-	}
-
-	// Create session in rig directory
-	if err := t.NewSession(sessionName, rigPath); err != nil {
-		return err
-	}
-
-	// Set environment (non-fatal: session works without these)
-	bdActor := fmt.Sprintf("%s/witness", rigName)
-	_ = t.SetEnvironment(sessionName, "GT_ROLE", "witness")
-	_ = t.SetEnvironment(sessionName, "GT_RIG", rigName)
-	_ = t.SetEnvironment(sessionName, "BD_ACTOR", bdActor)
-
-	// Apply theme (non-fatal: theming failure doesn't affect operation)
-	theme := tmux.AssignTheme(rigName)
-	_ = t.ConfigureGasTownSession(sessionName, theme, "", "Witness", rigName)
-
-	// Launch Claude using runtime config
-	// Export GT_ROLE and BD_ACTOR in the command since tmux SetEnvironment only affects new panes
-	claudeCmd := config.BuildAgentStartupCommand("witness", bdActor, rigPath, "")
-	if err := t.SendKeysDelayed(sessionName, claudeCmd, 200); err != nil {
-		return err
-	}
-
-	// Wait for Claude to start (non-fatal)
-	if err := t.WaitForCommand(sessionName, constants.SupportedShells, constants.ClaudeStartTimeout); err != nil {
-		// Non-fatal
-	}
-
-	// Accept bypass permissions warning dialog if it appears.
-	_ = t.AcceptBypassPermissionsWarning(sessionName)
-
-	time.Sleep(constants.ShutdownNotifyDelay)
-
-	// Inject startup nudge for predecessor discovery via /resume
-	address := fmt.Sprintf("%s/witness", rigName)
-	_ = session.StartupNudge(t, sessionName, session.StartupNudgeConfig{
-		Recipient: address,
-		Sender:    "deacon",
-		Topic:     "patrol",
-	}) // Non-fatal
-
-	return nil
-}
-
 // discoverRigs finds all rigs in the town.
 func discoverRigs(townRoot string) []string {
 	var rigs []string