fix(rig): remove route from routes.jsonl on rig remove (#910)

When a rig is removed with `gt rig remove`, the route entry in
routes.jsonl was not being cleaned up. This caused problems when
re-adding the rig with a different prefix, resulting in duplicate
entries and prefix mismatch errors.

The fix calls beads.RemoveRoute() during rig removal to clean up
the route entry from routes.jsonl.

Fixes #899

Co-authored-by: dementus <julianknutsen@users.noreply.github>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

internal/cmd/rig.go

@@ -505,6 +505,12 @@ func runRigRemove(cmd *cobra.Command, args []string) error {
 		return fmt.Errorf("loading rigs config: %w", err)
 	}
 
+	// Get the rig's beads prefix before removing (needed for route cleanup)
+	var beadsPrefix string
+	if entry, ok := rigsConfig.Rigs[name]; ok && entry.BeadsConfig != nil {
+		beadsPrefix = entry.BeadsConfig.Prefix
+	}
+
 	// Create rig manager
 	g := git.NewGit(townRoot)
 	mgr := rig.NewManager(townRoot, rigsConfig, g)
@@ -518,6 +524,14 @@ func runRigRemove(cmd *cobra.Command, args []string) error {
 		return fmt.Errorf("saving rigs config: %w", err)
 	}
 
+	// Remove route from routes.jsonl (issue #899)
+	if beadsPrefix != "" {
+		if err := beads.RemoveRoute(townRoot, beadsPrefix+"-"); err != nil {
+			// Non-fatal: log warning but continue
+			fmt.Printf("  %s Could not remove route from routes.jsonl: %v\n", style.Warning.Render("!"), err)
+		}
+	}
+
 	fmt.Printf("%s Rig %s removed from registry\n", style.Success.Render("✓"), name)
 	fmt.Printf("\nNote: Files at %s were NOT deleted.\n", filepath.Join(townRoot, name))
 	fmt.Printf("To delete: %s\n", style.Dim.Render(fmt.Sprintf("rm -rf %s", filepath.Join(townRoot, name))))