storkit: create 413_refactor_split_slack_rs_into_focused_modules

.storkit/work/1_backlog/404_bug_whatsapp_and_slack_missing_assign_command_handler.md

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----
-name: "WhatsApp and Slack missing assign command handler"
----
-
-# Bug 404: WhatsApp and Slack missing assign command handler
-
-## Description
-
-The assign command has a fallback handler in chat/commands/mod.rs that returns None. Only Matrix has pre-dispatch handling for this command. On WhatsApp and Slack, the command falls through to the LLM path.
-
-## Implementation Note
-
-Follow the **rebuild pattern** established in story 402.
-
-- `extract_assign_command` and `handle_assign` already exist in `server/src/chat/transport/matrix/assign.rs`
-- Add an async intercept in `server/src/chat/transport/whatsapp.rs` (see rebuild intercept ~line 1107) and `server/src/chat/transport/slack.rs` (see rebuild intercept ~line 845)
-- Call `crate::chat::transport::matrix::assign::extract_assign_command` to detect the command, then `crate::chat::transport::matrix::assign::handle_assign` to execute it
-- The fallback handler in `chat/commands/mod.rs` (`handle_assign_fallback` — note: the registry entry for `assign` currently calls `assign::handle_assign` synchronously; verify this doesn't conflict) stays as-is for `help` listing
-- The fallback in `chat/commands/assign.rs` may need to return `None` instead of a real response once the async path handles it
-
-## How to Reproduce
-
-1. Configure bot with transport = "whatsapp" or "slack"\n2. Send "assign <story_id> <agent>" to the bot\n3. Check server logs
-
-## Actual Result
-
-Command falls through to LLM instead of assigning the agent.
-
-## Expected Result
-
-The bot assigns the specified agent to the story and replies with confirmation.
-
-## Acceptance Criteria
-
-- [ ] WhatsApp transport handles assign command: assigns agent and replies with confirmation
-- [ ] Slack transport handles assign command: assigns agent and replies with confirmation

.storkit/work/1_backlog/413_refactor_split_slack_rs_into_focused_modules.md

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+---
+name: "Split slack.rs into focused modules"
+---
+
+# Refactor 413: Split slack.rs into focused modules
+
+## Current State
+
+- TBD
+
+## Desired State
+
+Refactor the monolithic server/src/chat/transport/slack.rs (1902 lines) into a slack/ directory with focused modules, mirroring the whatsapp/ module structure from story 409.
+
+## Acceptance Criteria
+
+- [ ] slack.rs is replaced by a slack/ directory with mod.rs re-exporting all public types
+- [ ] meta.rs contains SlackTransport struct, ChatTransport trait impl, and Slack API request/response types
+- [ ] commands.rs contains incoming message dispatch, permission logic, and slash command handling
+- [ ] format.rs contains markdown_to_slack() conversion
+- [ ] history.rs contains load_slack_history(), save_slack_history(), and SlackHistoryDump
+- [ ] verify.rs contains verify_slack_signature(), sha256(), and constant_time_eq()
+- [ ] mod.rs contains Slack event types, webhook handlers, and SlackWebhookContext
+- [ ] All existing tests are preserved and pass in their respective modules
+- [ ] No public API changes — all existing imports from other crates continue to work
+
+## Out of Scope
+
+- TBD