Exclude local credentials, private data, and generated artifacts

Import the existing local project snapshot. This commit organizes existing files; it does not represent newly developed functionality.

.gitignore

@@ -0,0 +1,24 @@
+__pycache__/
+*.pyc
+*.pyo
+*.pyd
+.env
+*.egg-info/
+dist/
+build/
+.pytest_cache/
+.coverage
+htmlcov/
+axon_index.sqlite3
+
+# Private environments and runtime state
+.env.*
+!.env.example
+*.session*
+*.db*
+*.sqlite*
+*.pem
+*.key
+*.log
+.venv/
+venv/