Fix CLI mismatches from bd-2fs7 (wisp->ephemeral) (gt-pu1t5)

bd-2fs7 moved wisp/pour under bd mol, but gastown was not updated.
This caused handoff failures - gt mail send errored with 'unknown flag: --wisp'.

Changes:
- router.go: --wisp -> --ephemeral for bd create
- patrol_helpers.go: bd wisp create -> bd mol wisp create
- wisp_check.go: bd wisp gc -> bd mol wisp gc

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

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

internal/mail/router.go

@@ -147,9 +147,9 @@ func (r *Router) Send(msg *Message) error {
 	// Add actor for attribution (sender identity)
 	args = append(args, "--actor", msg.From)
 
-	// Add --wisp flag for ephemeral messages (stored in single DB, filtered from JSONL export)
+	// Add --ephemeral flag for ephemeral messages (stored in single DB, filtered from JSONL export)
 	if r.shouldBeWisp(msg) {
-		args = append(args, "--wisp")
+		args = append(args, "--ephemeral")
 	}
 
 	beadsDir := r.resolveBeadsDir(msg.To)