CI/Skills: add Python lint and test harness for skills scripts (#24246)

* CI: add skills Python checks job

* Chore: add Python lint and test pre-commit hooks

* Tests: fix skill-creator package test import path

* Chore: add Python tooling config for skills scripts

* CI: run all skills Python tests

* Chore: run all skills Python tests in pre-commit

* Chore: enable pytest discovery for all skills tests

* Changelog: note skills Python quality harness

.pre-commit-config.yaml

@@ -69,6 +69,24 @@ repos:
         args: [--persona=regular, --min-severity=medium, --min-confidence=medium]
         exclude: "^(vendor/|Swabble/)"
 
+  # Python checks for skills scripts
+  - repo: https://github.com/astral-sh/ruff-pre-commit
+    rev: v0.14.1
+    hooks:
+      - id: ruff
+        files: "^skills/.*\\.py$"
+        args: [--config, pyproject.toml]
+
+  - repo: local
+    hooks:
+      - id: skills-python-tests
+        name: skills python tests
+        entry: pytest -q skills
+        language: python
+        additional_dependencies: [pytest>=8,<9]
+        pass_filenames: false
+        files: "^skills/.*\\.py$"
+
   # Project checks (same commands as CI)
   - repo: local
     hooks: