feat(refinery): Auto-detect rig from cwd for refinery commands

All gt refinery subcommands (start, stop, status, queue, attach) now
accept an optional rig argument. If not provided, the rig is inferred
from the current working directory.

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

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

internal/cmd/statusline.go

@@ -287,7 +287,7 @@ func runRefineryStatusLine(rigName string) error {
 	}
 
 	// Get refinery manager using shared helper
-	mgr, _, err := getRefineryManager(rigName)
+	mgr, _, _, err := getRefineryManager(rigName)
 	if err != nil {
 		// Fallback to simple status if we can't access refinery
 		fmt.Printf("%s MQ: ? |", AgentTypeIcons[AgentRefinery])