story-kit: done 269_story_file_references_in_web_ui_chat_input

.story_kit/work/5_done/269_story_file_references_in_web_ui_chat_input.md

@@ -0,0 +1,23 @@
+---
+name: "@ file references in web UI chat input"
+merge_failure: "Squash-merge produced an empty diff. The feature branch's code changes (commits 2a01069, 4f890fc) are already present in master — only .story_kit/ pipeline files differ. The code was likely merged via a prior merge operation. Human intervention needed to determine whether to accept the story as-is or investigate how the code reached master."
+---
+
+# Story 269: @ file references in web UI chat input
+
+## User Story
+
+As a user chatting in the web UI, I want to type @ to get an autocomplete overlay listing project files, so that I can reference specific files in my messages the same way Zed and Claude Code do.
+
+## Acceptance Criteria
+
+- [ ] Typing @ in the chat input triggers a file picker overlay
+- [ ] Overlay searches project files with fuzzy matching as the user types after @
+- [ ] Selecting a file inserts a reference into the message (e.g. @path/to/file.rs)
+- [ ] The referenced file contents are included as context when the message is sent to the LLM
+- [ ] Overlay is dismissable with Escape
+- [ ] Multiple @ references can be used in a single message
+
+## Out of Scope
+
+- TBD