chore: add ruff formatter, .gitignore, and uv convention (#40)

* chore: add ruff formatter, .gitignore, and uv convention

- Add ruff as dev dependency with basic config
- Add PostToolUse hook to auto-run ruff on .py edits
- Create .gitignore to exclude __pycache__ and settings.local.json
- Document uv run convention in CLAUDE.md
- Add CLAUDE.md, .claude/settings.json, and skills
- Apply ruff formatting to existing Python files

* fix: address CR feedback on hooks and uv run convention

- Fix hooks to read file_path from stdin JSON via jq instead of
  nonexistent $CLAUDE_FILE env var
- Update CLAUDE.md commands to use uv run python3 consistently
- Update skills to use uv run for python/dedup commands

uv.lock

@@ -23,6 +23,7 @@ dependencies = [
 [package.dev-dependencies]
 dev = [
     { name = "pytest" },
+    { name = "ruff" },
 ]
 
 [package.metadata]
@@ -32,7 +33,10 @@ requires-dist = [
 ]
 
 [package.metadata.requires-dev]
-dev = [{ name = "pytest", specifier = ">=8.0" }]
+dev = [
+    { name = "pytest", specifier = ">=8.0" },
+    { name = "ruff", specifier = ">=0.11" },
+]
 
 [[package]]
 name = "imagehash"
@@ -326,6 +330,31 @@ wheels = [
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 ]
 
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