- Add Matrix bot to the feature list and prerequisites.
- Add a Matrix Appservice section covering config, Synapse registration,
and the shared conversation pipeline.
- Document the matrix config section in CONFIGURATION.md.
- Add a ready-to-use Synapse appservice registration template
(matrix/steward_appservice.yaml).
- Document the Gitea Actions build/deploy workflow and kube manifests.
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
