feat: Add rig infra cycling (witness ↔ refinery)

Extended the unified cycle system to include rig infrastructure sessions:
- Witness ↔ Refinery (per rig) now cycle with C-b n/p

Also moved SetCycleBindings into ConfigureGasTownSession so ALL Gas Town
sessions automatically get the unified cycle bindings. Removed redundant
individual calls from crew, mayor, and deacon startup code.

Cycle groups are now:
- Town: Mayor ↔ Deacon
- Crew (per rig): All crew members in same rig
- Infra (per rig): Witness ↔ Refinery

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

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

internal/cmd/start.go

@@ -753,12 +753,10 @@ func runStartCrew(cmd *cobra.Command, args []string) error {
 		}
 
 		// Apply rig-based theming (non-fatal: theming failure doesn't affect operation)
+		// Note: ConfigureGasTownSession includes cycle bindings
 		theme := getThemeForRig(rigName)
 		_ = t.ConfigureGasTownSession(sessionID, theme, rigName, name, "crew")
 
-		// Set up C-b n/p keybindings for crew session cycling (non-fatal)
-		_ = t.SetCrewCycleBindings(sessionID)
-
 		// Wait for shell to be ready after session creation
 		if err := t.WaitForShellReady(sessionID, 5*time.Second); err != nil {
 			return fmt.Errorf("waiting for shell: %w", err)
@@ -887,12 +885,10 @@ func startCrewMember(rigName, crewName, townRoot string) error {
 	_ = t.SetEnvironment(sessionID, "GT_CREW", crewName)
 
 	// Apply rig-based theming
+	// Note: ConfigureGasTownSession includes cycle bindings
 	theme := getThemeForRig(rigName)
 	_ = t.ConfigureGasTownSession(sessionID, theme, rigName, crewName, "crew")
 
-	// Set up C-b n/p keybindings for crew session cycling
-	_ = t.SetCrewCycleBindings(sessionID)
-
 	// Wait for shell to be ready
 	if err := t.WaitForShellReady(sessionID, 5*time.Second); err != nil {
 		return fmt.Errorf("waiting for shell: %w", err)