- ACP/control plane: refresh cached runtime handles when agent config changes so ACP sessions stop using stale runtimes after `agents.defaults` edits. Fixes #82237. Thanks @giodl73-repo.

- Gateway/sessions: scope session data lookups by agent id so multi-agent gateway state cannot cross-leak session records across configured agents. (#81386) Thanks @pgondhi987.

- Gateway/restart: mark active main sessions as restart-aborted before forced restarts so startup recovery can resume interrupted turns instead of leaving them stranded as running. Fixes #82433. (#82772) Thanks @joshavant.

- Agents/media: require generated music/video completion agents to use the message tool for visible delivery and stop merging generated image attachments into message-tool-only source reply mirrors, avoiding direct fallback posts that can duplicate media the model already sent.

- Agents/media: accept generated media attachments on internal completion events and report delivery-loss failures as errors, so completed background music/video tasks do not disappear after provider success.

- Matrix/approvals: release in-flight reaction bindings when the channel approval handler stops mid-delivery, preventing stale approval targets after restart. Fixes #82485. (#82482) Thanks @Feelw00.