storkit: done 443_refactor_extract_shared_find_story_name_from_commands

.storkit/work/5_done/443_refactor_extract_shared_find_story_name_from_commands.md

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+---
+name: "Extract shared find_story_name from commands"
+---
+
+# Refactor 443: Extract shared find_story_name from commands
+
+## Current State
+
+- TBD
+
+## Desired State
+
+`find_story_name` is nearly identical in `chat/commands/overview.rs` and `chat/commands/unreleased.rs` (minor style diff: `let stages` vs `const STAGES`). Extract to a shared location (e.g. `chat::commands::util` or `io::stories`) and have both callers use it.
+
+## Acceptance Criteria
+
+- [ ] Single shared find_story_name function exists
+- [ ] Both overview.rs and unreleased.rs use the shared version
+- [ ] Private copies are removed
+
+## Out of Scope
+
+- TBD