Delete NOTES.md

NOTES.md

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-## Update Notes
-
-Date: 2026-05-05
-
-This update fixes answer-thread linking and adds runtime-only related answers without changing the data schema.
-
-### What changed
-
-1. Answer linking fix
-- Frontend answer submissions now include the current question text.
-- Backend answer attachment now checks whether the loaded conversation actually belongs to that question.
-- If the user is answering a new question that was only semantically matched, a fresh conversation is created before saving the answer.
-
-2. Related answers
-- `ask` now returns a `related` list built from the top semantic matches at runtime.
-- Related answers are read-only in the UI and are shown as contextual help, not as part of the active thread.
-- No database migration or schema change was introduced.
-
-3. UI and UX polish
-- Added the app logo from `logo.png` to the top bar and page icon.
-- Related answers are visually separated from the main thread to reduce confusion.
-- The diffusion animation now reveals answer text progressively by token instead of using a single blur-to-clear block.
-
-### Behavior after update
-
-- Exact match:
-  - shows the best answer
-  - shows other answers
-  - shows related answers
-
-- Similar-but-not-same match:
-  - can still show existing knowledge
-  - does not write into the matched conversation
-  - creates a correct new conversation when the user submits an answer
-
-### Files changed
-
-- `main.py`
-- `index.html`
-- `NOTES.md`