chore(self-improve): apply P1 Improve retrieval fallback ordering

proposals/p1-improve-retrieval-fallback-ordering.md

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+# P1: Improve retrieval fallback ordering
+
+- Objective: Improve the look of the UI
+- Release: 
+- Risk: low
+- Auto apply safe: True
+
+## Problem
+Low-confidence drafts still occur when release-filtered retrieval returns no hits.
+
+## Change
+Add deterministic fallback chain and expose retrieval diagnostics in API responses.
+
+## Files
+- `app.py`
+
+## Tests
+- Call /assistant/draft with missing release_name and verify non-empty sources fallback.
+
+_Generated at 2026-02-14T20:57:33.384354+00:00_