docs: Gitea PyPI install paths and publish automation

Add make package-check/publish-gitea, tag-triggered Gitea Actions workflow,
PACKAGE_RELEASE.md, and update README/GETTING_STARTED install instructions
for the Coulomb registry (v1.1.0+).

README.md

@@ -37,13 +37,21 @@ python3 -m build && make install-local
 source .venv/bin/activate  # Required for each session
 ```
 
-**From PyPI (Coming Soon):**
+**From Gitea PyPI (v1.1.0+):**
 ```bash
-pip install kaizen-agentic  # Available after v1.0.0 publication
-# or
-pipx install kaizen-agentic  # Recommended for global CLI tools
+export GITEA_PACKAGE_USER=<gitea-user>
+export GITEA_PACKAGE_TOKEN=<package-token>
+
+pip install kaizen-agentic \
+  --extra-index-url "https://${GITEA_PACKAGE_USER}:${GITEA_PACKAGE_TOKEN}@gitea.coulomb.social/api/packages/coulomb/pypi/simple/"
+
+# or global CLI via pipx
+pipx install kaizen-agentic \
+  --pip-args="--extra-index-url https://${GITEA_PACKAGE_USER}:${GITEA_PACKAGE_TOKEN}@gitea.coulomb.social/api/packages/coulomb/pypi/simple/"
 ```
 
+See [docs/PACKAGE_RELEASE.md](docs/PACKAGE_RELEASE.md) for release and CI details.
+
 ### Your First Project (New Users)
 **👋 New to Kaizen Agentic?** Follow our [Hello World Tutorial](docs/HELLO_WORLD_TUTORIAL.md) for a complete step-by-step guide.