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+).

docs/PACKAGE_RELEASE.md

@@ -0,0 +1,80 @@
+# Python Package Release
+
+`kaizen-agentic` publishes as the `kaizen-agentic` Python package on the Coulomb
+Gitea PyPI registry. Public [pypi.org](https://pypi.org/) distribution is optional
+and not required for ecosystem use.
+
+## Install (consumers)
+
+Dependencies such as `pyyaml` resolve from public PyPI. Use Gitea as an extra index:
+
+```bash
+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/"
+```
+
+Global CLI via pipx:
+
+```bash
+pipx install kaizen-agentic \
+  --pip-args="--extra-index-url https://${GITEA_PACKAGE_USER}:${GITEA_PACKAGE_TOKEN}@gitea.coulomb.social/api/packages/coulomb/pypi/simple/"
+```
+
+Do not commit tokenized index URLs. Inject credentials via environment variables or
+CI secrets.
+
+## Local Release
+
+Build and validate artifacts:
+
+```bash
+make package-check
+```
+
+Publish to the Coulomb organization registry:
+
+```bash
+TWINE_USERNAME=<gitea-user> \
+TWINE_PASSWORD=<package-token> \
+make publish-gitea
+```
+
+Package upload endpoint:
+
+```text
+https://gitea.coulomb.social/api/packages/coulomb/pypi
+```
+
+Consumer simple index:
+
+```text
+https://gitea.coulomb.social/api/packages/coulomb/pypi/simple/
+```
+
+## Gitea Actions Release
+
+The `.gitea/workflows/publish-python-package.yml` workflow publishes on tags
+matching `v*`. Configure these repository secrets before cutting a release:
+
+- `GITEA_PACKAGE_USER`
+- `GITEA_PACKAGE_TOKEN`
+
+Example:
+
+```bash
+git tag v1.2.0
+git push origin v1.2.0
+```
+
+## Public PyPI (optional)
+
+When pypi.org credentials are configured (`~/.pypirc` or `TWINE_PASSWORD` API
+token with `TWINE_USERNAME=__token__`):
+
+```bash
+make release-publish
+python -m twine upload dist/*
+```