chore: interview before fixes and keep HANDOFF.md tiny

Require a short user interview before implementing bugs/features, and overwrite or clear HANDOFF.md so it never accumulates session history.

Co-authored-by: Cursor <cursoragent@cursor.com>

agents-docs/LESSONS-INDEX.md

@@ -53,7 +53,8 @@ Tags help grepping: `rg '\\[attachments\\]' agents-docs/LESSONS-INDEX.md`
 - Use blob URLs for inline attachment previews — `[attachments] [electron]`
 - Resolve Electron drag-and-drop file paths with webUtils — `[attachments] [electron]`
 - Preserve uploader local attachment paths across sync — `[attachments] [persistence]`
+- Interview before coding; don’t guess the fix — `[workflow] [bugs] [tokens]`
 - Prove the asked behavior; unit-green is not done — `[verification] [testing] [workflow]`
 - Default to `toju-app/` + targeted `electron/` + CI; do not crawl the monorepo — `[workflow] [tokens] [scope]`
-- Write HANDOFF.md and ask the user for a new chat — agents cannot open chats — `[workflow] [tokens] [handoff]`
+- Write/overwrite HANDOFF.md for new chats; clear it when the task finishes — `[workflow] [tokens] [handoff]`