feat: add command aliases for PGT parity (may, sess, ref, sp, cat, stat)

Add Cobra aliases to match PGT abbreviation support:
- mayor → may (gt may at now works)
- session → sess
- refinery → ref
- spawn → sp
- polecat → cat
- status → stat

This enables the same abbreviated commands that worked in PGT, like
"gt may at" to attach to the Mayor session.

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

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

internal/cmd/status.go

@@ -17,8 +17,9 @@ import (
 var statusJSON bool
 
 var statusCmd = &cobra.Command{
-	Use:   "status",
-	Short: "Show overall town status",
+	Use:     "status",
+	Aliases: []string{"stat"},
+	Short:   "Show overall town status",
 	Long: `Display the current status of the Gas Town workspace.
 
 Shows town name, registered rigs, active polecats, and witness status.`,