v0.9.1

Cayu improves release validation and separates internal storage and event-schema
ownership while preserving the public contracts introduced in v0.9.0.

• Register all maintenance qualification cases and check registry coverage in
  ordinary pull-request CI. Consolidate the five fixture journeys into one
  qualification scenario and update concurrent gateway test assertions to avoid
  depending on execution order.
• Fix FFmpeg installation in Cayu’s own CI through the shared apt action, using
  the HTTPS archive for Ubuntu Azure and GCE mirror sources.
• Separate SQLite transaction ownership from schema support and shared event
  schemas from runtime projection, preserving supported imports and serialized
  model identities.

The storage revision remains 115 and the server contract remains 48. When
upgrading from a version older than v0.9.0, follow the full
v0.9.0 upgrade guidance:
migrate storage to revision 115, regenerate clients for server contract 48
(previously 47), upgrade the dashboard with the server, refresh application
lockfiles, and follow the cayu cloud init refresh instructions. For installs
older than v0.8.1, also review the
v0.8.0 and earlier upgrade guidance.