chore: update .gitignore, remove tracked .pi-lens files, and sync pending changes

- Add .cache to .gitignore
- Remove .pi-lens/ from git tracking (already ignored)
- Update pi-agent-runner, pi-agent-wrapper modules
- Update claude-code agent module
- Update overlays, opencode-desktop package, and tests

overlays/default.nix

@@ -1,7 +1,6 @@
 {inputs, ...}: {
   # This one brings our custom packages from the 'pkgs' directory
-  additions = final: prev:
-    (import ../pkgs {pkgs = final;});
+  additions = final: prev: (import ../pkgs {pkgs = final;});
 
   # This one contains whatever you want to overlay
   # You can change versions, add patches, set compilation flags, anything really.