storkit: done 413_refactor_split_slack_rs_into_focused_modules

.storkit/work/1_backlog/414_story_loc_command_filters_out_known_huge_files.md

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----
-name: "loc command filters out known-huge files"
----
-
-# Story 414: loc command filters out known-huge files
-
-## User Story
-
-As a ..., I want ..., so that ...
-
-## Acceptance Criteria
-
-- [ ] loc command excludes lockfiles and generated files (e.g. package-lock.json, Cargo.lock, frontend/package-lock.json) from results
-- [ ] Exclusion list is defined as a constant, easy to extend
-- [ ] Excluded files do not count toward line totals
-
-## Out of Scope
-
-- TBD

.storkit/work/5_done/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