fix(npm): exclude __pycache__ from tarball via prepack hook + .npmignore

- prepack script walks scripts/ tests/ examples/ and removes __pycache__ dirs
  before npm packs the tarball. Reduces published package from 43→33 files,
  112kB→65kB.
- .npmignore as belt-and-suspenders second filter (won't take effect when
  files[] whitelist is present, but documents intent and works for tools
  that respect it).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: CreatmanCEO

.npmignore

@@ -0,0 +1,34 @@
+# npm package contents are governed by package.json `files`.
+# This .npmignore is a belt-and-suspenders second filter for things that
+# can sneak in via included directories.
+
+# Python build artefacts
+__pycache__/
+*.pyc
+*.pyo
+.pytest_cache/
+.ruff_cache/
+.mypy_cache/
+
+# Repo dev infra (not needed by end users)
+tests/
+.github/
+pyproject.toml
+requirements-dev.txt
+
+# Editor / OS
+.DS_Store
+Thumbs.db
+.vscode/
+.idea/
+
+# Skill state from local dev runs
+.isolation-verified
+fixtures/iso-test/
+playwright/.auth/
+test-results/
+playwright-report/
+reports/
+
+# Local env
+.env*

package.json

@@ -42,6 +42,7 @@
   },
   "type": "commonjs",
   "scripts": {
-    "test": "echo 'Python tests live under tests/python/. Run: pip install -r requirements-dev.txt && pytest'"
+    "test": "echo 'Python tests live under tests/python/. Run: pip install -r requirements-dev.txt && pytest'",
+    "prepack": "node -e \"const fs=require('fs'),p=require('path'),walk=(d)=>fs.existsSync(d)&&fs.readdirSync(d).forEach(f=>{const x=p.join(d,f);if(fs.statSync(x).isDirectory()){if(f==='__pycache__'){fs.rmSync(x,{recursive:true,force:true});console.log('cleaned',x);}else walk(x);}});walk('scripts');walk('tests');walk('examples');\""
   }
 }