storkit: create 383_refactor_reorganize_chat_system_into_chat_module_with_transport_submodules

.storkit/work/1_backlog/383_refactor_reorganize_chat_system_into_chat_module_with_transport_submodules.md

@@ -0,0 +1,41 @@
+---
+name: "Reorganize chat system into chat module with transport submodules"
+---
+
+# Refactor 383: Reorganize chat system into chat module with transport submodules
+
+## Current State
+
+- TBD
+
+## Desired State
+
+Currently chat-related code is scattered at the top level of `src/`: `transport.rs`, `whatsapp.rs`, `slack.rs`, plus `matrix/` as a directory module. This should be reorganized into a clean module hierarchy:
+
+```
+src/
+  chat/
+    mod.rs          # Generic chat traits, types, ChatTransport etc.
+    transport/
+      mod.rs
+      matrix/       # Existing matrix module moved here
+      whatsapp.rs   # Existing whatsapp.rs moved here
+      slack.rs      # Existing slack.rs moved here
+      twilio.rs     # Future Twilio transport
+```
+
+The `ChatTransport` trait and shared chat types should live in `chat/mod.rs`. Each transport implementation becomes a submodule of `chat::transport`.
+
+## Acceptance Criteria
+
+- [ ] ChatTransport trait and shared chat types live in `chat/mod.rs`
+- [ ] Matrix transport lives in `chat/transport/matrix/`
+- [ ] WhatsApp transport lives in `chat/transport/whatsapp.rs`
+- [ ] Slack transport lives in `chat/transport/slack.rs`
+- [ ] Top-level `transport.rs`, `whatsapp.rs`, `slack.rs`, and `matrix/` are removed
+- [ ] All existing tests pass without modification (or with only import path changes)
+- [ ] No functional changes — pure file reorganization and re-exports
+
+## Out of Scope
+
+- TBD