fix: clean up dead code and fix indentation in runtime PR

- Remove unused ensureRefinerySession function from start.go
- Remove unused ensureSession and ensureWitness functions from up.go
- Remove unused ensureWitnessSession function from witness.go
- Remove orphaned imports (runtime, session, constants, config, rig, filepath, time)
- Fix indentation error in daemon.go triggerPendingSpawns comment

These functions were added as part of the Codex/OpenCode runtime support
but were never wired up. The existing managers (refinery.Manager.Start,
witness.Manager.Start) already handle session creation.

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

internal/cmd/witness.go

@@ -5,15 +5,8 @@ import (
 	"fmt"
 	"os"
 	"os/exec"
-	"path/filepath"
-	"time"
 
 	"github.com/spf13/cobra"
-	"github.com/steveyegge/gastown/internal/config"
-	"github.com/steveyegge/gastown/internal/constants"
-	"github.com/steveyegge/gastown/internal/rig"
-	"github.com/steveyegge/gastown/internal/runtime"
-	"github.com/steveyegge/gastown/internal/session"
 	"github.com/steveyegge/gastown/internal/style"
 	"github.com/steveyegge/gastown/internal/tmux"
 	"github.com/steveyegge/gastown/internal/witness"
@@ -269,87 +262,6 @@ func witnessSessionName(rigName string) string {
 	return fmt.Sprintf("gt-%s-witness", rigName)
 }
 
-// ensureWitnessSession creates a witness tmux session if it doesn't exist.
-// Returns true if a new session was created, false if it already existed.
-func ensureWitnessSession(rigName string, r *rig.Rig) (bool, error) {
-	t := tmux.NewTmux()
-	sessionName := witnessSessionName(rigName)
-
-	// Check if session already exists
-	running, err := t.HasSession(sessionName)
-	if err != nil {
-		return false, fmt.Errorf("checking session: %w", err)
-	}
-
-	if running {
-		return false, nil
-	}
-
-	// Working directory is the witness's rig clone (if it exists) or witness dir
-	// This ensures gt prime detects the Witness role correctly
-	witnessDir := filepath.Join(r.Path, "witness", "rig")
-	if _, err := os.Stat(witnessDir); os.IsNotExist(err) {
-		// Try witness/ without rig subdirectory
-		witnessDir = filepath.Join(r.Path, "witness")
-		if _, err := os.Stat(witnessDir); os.IsNotExist(err) {
-			// Fall back to rig path (shouldn't happen in normal setup)
-			witnessDir = r.Path
-		}
-	}
-
-	// Ensure Claude settings exist (autonomous role needs mail in SessionStart)
-	runtimeConfig := config.LoadRuntimeConfig(r.Path)
-	if err := runtime.EnsureSettingsForRole(witnessDir, "witness", runtimeConfig); err != nil {
-		return false, fmt.Errorf("ensuring runtime settings: %w", err)
-	}
-
-	// Create new tmux session
-	if err := t.NewSession(sessionName, witnessDir); err != nil {
-		return false, fmt.Errorf("creating session: %w", err)
-	}
-
-	// Set environment
-	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 Gas Town theming (non-fatal: theming failure doesn't affect operation)
-	theme := tmux.AssignTheme(rigName)
-	_ = t.ConfigureGasTownSession(sessionName, theme, rigName, "witness", "witness")
-
-	// Launch Claude directly (no shell respawn loop)
-	// Restarts are handled by daemon via LIFECYCLE mail or deacon health-scan
-	// NOTE: No gt prime injection needed - SessionStart hook handles it automatically
-	// Export GT_ROLE and BD_ACTOR in the command since tmux SetEnvironment only affects new panes
-	if err := t.SendKeys(sessionName, config.BuildAgentStartupCommand("witness", bdActor, "", "")); err != nil {
-		return false, fmt.Errorf("sending command: %w", err)
-	}
-
-	// Wait for Claude to start (non-fatal)
-	if err := t.WaitForCommand(sessionName, constants.SupportedShells, constants.ClaudeStartTimeout); err != nil {
-		// Non-fatal
-	}
-	time.Sleep(constants.ShutdownNotifyDelay)
-	_ = runtime.RunStartupFallback(t, sessionName, "witness", runtimeConfig)
-
-	// 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
-
-	// GUPP: Gas Town Universal Propulsion Principle
-	// Send the propulsion nudge to trigger autonomous patrol execution.
-	// Wait for beacon to be fully processed (needs to be separate prompt)
-	time.Sleep(2 * time.Second)
-	_ = t.NudgeSession(sessionName, session.PropulsionNudgeForRole("witness", witnessDir)) // Non-fatal
-
-	return true, nil
-}
-
 func runWitnessAttach(cmd *cobra.Command, args []string) error {
 	rigName := ""
 	if len(args) > 0 {