storkit: done 392_refactor_extract_shared_transport_utilities_from_matrix_module_into_chat_submodule

.storkit/work/5_done/392_refactor_extract_shared_transport_utilities_from_matrix_module_into_chat_submodule.md

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+---
+name: "Extract shared transport utilities from matrix module into chat submodule"
+agent: "coder-opus"
+---
+
+# Refactor 392: Extract shared transport utilities from matrix module into chat submodule
+
+## Current State
+
+- TBD
+
+## Desired State
+
+Several functions currently living in the matrix transport module are used by all transports (WhatsApp, Slack, Matrix). These should be pulled up into a shared location under the chat module. Candidates include: strip_prefix_ci, strip_bot_mention, try_handle_command, drain_complete_paragraphs, markdown_to_whatsapp (pattern could generalize), chunk_for_whatsapp, and the command dispatch infrastructure. A chat::util or chat::text submodule would be a natural home for string utilities like strip_prefix_ci. The command dispatch (try_handle_command, CommandDispatch, BotCommand registry) could live in chat::commands.
+
+## Acceptance Criteria
+
+- [ ] Shared string utilities (strip_prefix_ci, strip_bot_mention, drain_complete_paragraphs) moved to a chat::util or chat::text submodule
+- [ ] Command dispatch infrastructure (try_handle_command, CommandDispatch, BotCommand, command registry) moved to chat::commands
+- [ ] Per-transport formatting functions (markdown_to_whatsapp, markdown_to_slack) remain in their respective transport modules
+- [ ] All transports import from the new shared location instead of reaching into matrix::
+- [ ] No functional changes — purely structural refactor
+- [ ] All existing tests pass and move with their code
+
+## Out of Scope
+
+- TBD