storkit: done 409_refactor_split_whatsapp_rs_into_focused_modules

.storkit/work/5_done/409_refactor_split_whatsapp_rs_into_focused_modules.md

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+---
+name: "Split whatsapp.rs into focused modules"
+retry_count: 2
+blocked: true
+---
+
+# Refactor 409: Split whatsapp.rs into focused modules
+
+## Current State
+
+- TBD
+
+## Desired State
+
+whatsapp.rs is 2000+ lines making it expensive for agents to navigate and edit. Split into focused modules under chat/transport/whatsapp/.
+
+## Acceptance Criteria
+
+- [x] mod.rs contains webhook handlers, WebhookContext, and re-exports
+- [x] meta.rs contains WhatsAppTransport, ChatTransport impl, and Graph API structs/calls
+- [x] twilio.rs contains TwilioWhatsAppTransport, ChatTransport impl, and Twilio structs/calls
+- [x] history.rs contains WhatsAppConversationHistory, load/save_whatsapp_history, and MessagingWindowTracker
+- [x] commands.rs contains handle_incoming_message, handle_llm_message, and all async command dispatch
+- [x] format.rs contains markdown_to_whatsapp and chunk_for_whatsapp
+- [x] All existing tests pass
+- [x] No behaviour changes — pure structural refactor
+
+## Out of Scope
+
+- TBD
+
+## Test Results
+
+<!-- storkit-test-results: {"unit":[{"name":"whatsapp::format::tests::chunk_short_message_returns_single_chunk","status":"pass","details":null},{"name":"whatsapp::format::tests::chunk_exactly_at_limit_returns_single_chunk","status":"pass","details":null},{"name":"whatsapp::format::tests::chunk_splits_on_paragraph_boundary","status":"pass","details":null},{"name":"whatsapp::format::tests::chunk_splits_on_line_boundary_when_no_paragraph_break","status":"pass","details":null},{"name":"whatsapp::format::tests::chunk_hard_splits_continuous_text","status":"pass","details":null},{"name":"whatsapp::format::tests::chunk_empty_string_returns_single_empty","status":"pass","details":null},{"name":"whatsapp::format::tests::md_to_wa_converts_headers_to_bold","status":"pass","details":null},{"name":"whatsapp::format::tests::md_to_wa_converts_bold","status":"pass","details":null},{"name":"whatsapp::format::tests::md_to_wa_converts_bold_italic","status":"pass","details":null},{"name":"whatsapp::format::tests::md_to_wa_converts_strikethrough","status":"pass","details":null},{"name":"whatsapp::format::tests::md_to_wa_converts_links","status":"pass","details":null},{"name":"whatsapp::format::tests::md_to_wa_removes_horizontal_rules","status":"pass","details":null},{"name":"whatsapp::format::tests::md_to_wa_preserves_inline_code","status":"pass","details":null},{"name":"whatsapp::format::tests::md_to_wa_preserves_code_blocks","status":"pass","details":null},{"name":"whatsapp::format::tests::md_to_wa_mixed_message","status":"pass","details":null},{"name":"whatsapp::format::tests::md_to_wa_passthrough_plain_text","status":"pass","details":null},{"name":"whatsapp::history::tests::messaging_window_tracker_basics","status":"pass","details":null},{"name":"whatsapp::history::tests::messaging_window_tracker_expiry","status":"pass","details":null},{"name":"whatsapp::history::tests::messaging_window_tracker_reset","status":"pass","details":null},{"name":"whatsapp::history::tests::load_empty_history","status":"pass","details":null},{"name":"whatsapp::history::tests::save_and_load_history","status":"pass","details":null},{"name":"whatsapp::twilio::tests::parse_twilio_form_valid","status":"pass","details":null},{"name":"whatsapp::twilio::tests::parse_twilio_form_missing_body","status":"pass","details":null},{"name":"whatsapp::twilio::tests::parse_twilio_form_missing_from","status":"pass","details":null},{"name":"whatsapp::commands::tests::parse_command_help","status":"pass","details":null},{"name":"whatsapp::commands::tests::parse_command_status","status":"pass","details":null},{"name":"whatsapp::commands::tests::parse_command_unknown","status":"pass","details":null},{"name":"whatsapp::mod::tests::webhook_context_basics","status":"pass","details":null}],"integration":[]} -->
+
+### Unit Tests (28 passed, 0 failed)
+
+- ✅ whatsapp::format::tests::chunk_short_message_returns_single_chunk
+- ✅ whatsapp::format::tests::chunk_exactly_at_limit_returns_single_chunk
+- ✅ whatsapp::format::tests::chunk_splits_on_paragraph_boundary
+- ✅ whatsapp::format::tests::chunk_splits_on_line_boundary_when_no_paragraph_break
+- ✅ whatsapp::format::tests::chunk_hard_splits_continuous_text
+- ✅ whatsapp::format::tests::chunk_empty_string_returns_single_empty
+- ✅ whatsapp::format::tests::md_to_wa_converts_headers_to_bold
+- ✅ whatsapp::format::tests::md_to_wa_converts_bold
+- ✅ whatsapp::format::tests::md_to_wa_converts_bold_italic
+- ✅ whatsapp::format::tests::md_to_wa_converts_strikethrough
+- ✅ whatsapp::format::tests::md_to_wa_converts_links
+- ✅ whatsapp::format::tests::md_to_wa_removes_horizontal_rules
+- ✅ whatsapp::format::tests::md_to_wa_preserves_inline_code
+- ✅ whatsapp::format::tests::md_to_wa_preserves_code_blocks
+- ✅ whatsapp::format::tests::md_to_wa_mixed_message
+- ✅ whatsapp::format::tests::md_to_wa_passthrough_plain_text
+- ✅ whatsapp::history::tests::messaging_window_tracker_basics
+- ✅ whatsapp::history::tests::messaging_window_tracker_expiry
+- ✅ whatsapp::history::tests::messaging_window_tracker_reset
+- ✅ whatsapp::history::tests::load_empty_history
+- ✅ whatsapp::history::tests::save_and_load_history
+- ✅ whatsapp::twilio::tests::parse_twilio_form_valid
+- ✅ whatsapp::twilio::tests::parse_twilio_form_missing_body
+- ✅ whatsapp::twilio::tests::parse_twilio_form_missing_from
+- ✅ whatsapp::commands::tests::parse_command_help
+- ✅ whatsapp::commands::tests::parse_command_status
+- ✅ whatsapp::commands::tests::parse_command_unknown
+- ✅ whatsapp::mod::tests::webhook_context_basics
+
+### Integration Tests (0 passed, 0 failed)
+
+*No integration tests recorded.*