story-kit: start 269_story_file_references_in_web_ui_chat_input

.story_kit/work/2_current/269_story_file_references_in_web_ui_chat_input.md

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+---
+name: "@ file references in web UI chat input"
+merge_failure: "Rename/rename conflict on story file: master moved it to 4_merge/ while the feature branch has it in 2_current/. The auto-resolver cannot handle rename/rename conflicts. The story file needs to be resolved manually (likely by accepting the 4_merge/ location on master and removing the 2_current/ version from the feature branch), then re-triggering the merge."
+---
+
+# 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