osmaczko addcde03eb feat: introduce client event system ...

- Core returns `InboundResult` — a typed struct with an optional
  `NewConversation` and a `FrameOutcome` of decrypted messages.
- Client surfaces app-facing events via `Vec<Event>`, translated from
  `InboundResult` at the boundary.
- MLS group welcomes now produce a `ConversationStarted` event with no
  initial content, fixing the silent-group-join case where the inbox
  layer dropped the observation.
- C FFI exposes an `EventList` opaque type with indexed accessors and
  an `Invalid` sentinel for OOB / non-applicable reads.
- Symmetric `Inbox` / `InboxV2` handlers: both return
  `Result<InboundResult, _>` and own the persistence + ephemeral-key
  cleanup for the conversations they create.
- Updated and simplified `docs/adr/0001-client-event-system.md`.

2026-05-26 12:05:44 +02:00

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adr

feat: introduce client event system

2026-05-26 12:05:44 +02:00