- Add HostNotification::SelectionChangedV4 { tab_id, handles } with discriminant 7
- Broadcast active-tab selection changes at update() and automation_op boundaries
- Use stable order-independent signature to avoid spurious hover notifications
- Clear Scene selection in automation new/open to avoid stale handles
- Add crates/ocs_plugin_api/ARCHITECTURE.md and module-level rustdoc
- Cross-link README.md and docs/plugin-architecture.md
- Fix test env race with shared ENV_LOCK and EnvVarGuard helpers
- Add host_acadrust_source and source-hash comparison helpers to ocs_plugin_api.
- Track acadrust_source and acadrust_declared in ExternalPlugin/ReleaseInfo.
- Apply repo-level policy: if any release in a repo declares acadrust_source, undeclared v4+ releases from that repo are incompatible.
- Preserve API v2/v3 backwards compatibility: legacy undeclared releases stay installable.
- Update Plugin Manager UI to only offer compatible releases and show 'acadrust mismatch' status.
- Drop acadrust_version from gate logic; only acadrust_source is required.
Sebastian