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/polecat.go

@@ -26,8 +26,9 @@ var (
 )
 
 var polecatCmd = &cobra.Command{
-	Use:   "polecat",
-	Short: "Manage polecats in rigs",
+	Use:     "polecat",
+	Aliases: []string{"cat"},
+	Short:   "Manage polecats in rigs",
 	Long: `Manage polecat lifecycle in rigs.
 
 Polecats are worker agents that operate in their own git clones.

internal/cmd/refinery.go

@@ -23,8 +23,9 @@ var (
 )
 
 var refineryCmd = &cobra.Command{
-	Use:   "refinery",
-	Short: "Manage the merge queue processor",
+	Use:     "refinery",
+	Aliases: []string{"ref"},
+	Short:   "Manage the merge queue processor",
 	Long: `Manage the Refinery merge queue processor for a rig.
 
 The Refinery processes merge requests from polecats, merging their work

internal/cmd/session.go

@@ -29,8 +29,9 @@ var (
 )
 
 var sessionCmd = &cobra.Command{
-	Use:   "session",
-	Short: "Manage polecat sessions",
+	Use:     "session",
+	Aliases: []string{"sess"},
+	Short:   "Manage polecat sessions",
 	Long: `Manage tmux sessions for polecats.
 
 Sessions are tmux sessions running Claude for each polecat.

internal/cmd/spawn.go

@@ -29,8 +29,9 @@ var (
 )
 
 var spawnCmd = &cobra.Command{
-	Use:   "spawn <rig/polecat> | <rig>",
-	Short: "Spawn a polecat with work assignment",
+	Use:     "spawn <rig/polecat> | <rig>",
+	Aliases: []string{"sp"},
+	Short:   "Spawn a polecat with work assignment",
 	Long: `Spawn a polecat with a work assignment.
 
 Assigns an issue or task to a polecat and starts a session. If no polecat

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.`,