fix(orphan): prevent Claude Code session leaks on macOS

Three bugs were causing orphaned Claude processes to accumulate:

1. TTY comparison in orphan.go checked for "?" but macOS shows "??"
   - Orphan cleanup never found anything on macOS
   - Changed to check for both "?" and "??"

2. selfKillSession in done.go used basic tmux kill-session
   - Claude Code can survive SIGHUP
   - Now uses KillSessionWithProcesses for proper cleanup

3. Crew stop commands used basic KillSession
   - Same issue as #2
   - Updated runCrewRemove, runCrewStop, runCrewStopAll

Root cause of 383 accumulated sessions: every gt done and crew stop
left orphans, and the cleanup never worked on macOS.

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

internal/util/orphan.go

@@ -191,7 +191,8 @@ func FindOrphanedClaudeProcesses() ([]OrphanedProcess, error) {
 		etimeStr := fields[3]
 
 		// Only look for claude/codex processes without a TTY
-		if tty != "?" {
+		// Linux shows "?" for no TTY, macOS shows "??"
+		if tty != "?" && tty != "??" {
 			continue
 		}