chore(release): 0.0.3

Squash-merge lib-standardisation: adopt repo standards across packaging,
tooling, docs, and CI.

- standardize pyproject.toml (canonical packaging, lint config, extras, GSDFC pydoclint)
- add py.typed marker, modernize type hints and Google-style docstrings
- nest generated docs under docs/lib and docs/mcp; add hand-written wiki
- adopt standard Type A PyPI CI pipeline (tag==version guard + quality gate)
- promote generated CHANGELOG.md; bump version to 0.0.3

.gitignore

@@ -25,10 +25,17 @@ env/
 htmlcov/
 coverage.xml
 
+# Lint / type checking
+.mypy_cache/
+.ruff_cache/
+
 # Environment variables
 .env
 .env.local
 
+# Docs build artifacts
+site
+
 # OS
 .DS_Store
 Thumbs.db
@@ -38,7 +45,6 @@ Thumbs.db
 *.swo
 *~
 *.tmp
-site
 
 # Credentials
 client_secret_*.json