storkit: create 439_refactor_unify_story_stuck_states_into_a_single_status_field

.storkit/work/1_backlog/439_refactor_unify_story_stuck_states_into_a_single_status_field.md

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+---
+name: "Unify story stuck states into a single status field"
+---
+
+# Refactor 439: Unify story stuck states into a single status field
+
+## Current State
+
+- TBD
+
+## Desired State
+
+Eight Matrix transport files (assign.rs, delete.rs, start.rs, rebuild.rs, reset.rs, rmtree.rs, htop.rs, timer.rs) each contain their own private copies of `strip_prefix_ci` and `strip_bot_mention`. The canonical versions already live in `chat::util` with the correct `is_char_boundary` guard. The duplicates should be removed and all call sites should use `util::strip_bot_mention` instead.
+
+## Acceptance Criteria
+
+- [ ] All 8 private copies of strip_prefix_ci are removed
+- [ ] All 8 private copies of strip_bot_mention are removed
+- [ ] All call sites use chat::util::strip_bot_mention instead
+- [ ] Existing tests in util.rs continue to pass
+- [ ] No new copies of strip_prefix_ci exist outside util.rs
+
+## Out of Scope
+
+- TBD