Add Claude Code skills and streamline CLAUDE.md (#823)

* add claude code skills and streamline CLAUDE.md

* remove claude code attribution from PR skill

* update pr skill

.claude/skills/release/SKILL.md

@@ -0,0 +1,28 @@
+---
+name: release
+description: Bump the Plano version across all required files. Use when preparing a release.
+disable-model-invocation: true
+user-invocable: true
+---
+
+Prepare a release version bump. The user may provide the new version number as $ARGUMENTS (e.g., `/release 0.4.12`), or a bump type (`major`, `minor`, `patch`).
+
+If no argument is provided, read the current version from `cli/planoai/__init__.py`, auto-increment the patch version (e.g., `0.4.11` → `0.4.12`), and confirm with the user before proceeding.
+
+Update the version string in ALL of these files:
+
+- `.github/workflows/ci.yml`
+- `cli/planoai/__init__.py`
+- `cli/planoai/consts.py`
+- `cli/pyproject.toml`
+- `build_filter_image.sh`
+- `config/validate_plano_config.sh`
+- `docs/source/conf.py`
+- `docs/source/get_started/quickstart.rst`
+- `docs/source/resources/deployment.rst`
+- `apps/www/src/components/Hero.tsx`
+- `demos/llm_routing/preference_based_routing/README.md`
+
+Do NOT change version strings in `*.lock` files or `Cargo.lock`.
+
+After making changes, show a summary of all files modified and the old → new version.