api.py: remove 50KB truncation from /api/corpus/retry (completes F14)

The F14 fix on 2026-05-01 removed text[:50000] truncation from
watcher.py, ingest.py, and corpus_integrity.py. The retry endpoint
in api.py was missed — clicking 'Retry' on an ingest-failed file
in the SettingsPanel re-introduced the exact truncation pattern
F14 was meant to eliminate.

Found by Track 1 inventory 2026-05-02 (Finding 2 / divergence #2).

scripts/api.py

@@ -1071,7 +1071,7 @@ async def corpus_retry(request: Request, auth: str = Depends(require_auth)):
             ON CONFLICT (source) DO UPDATE SET
                 full_text = EXCLUDED.full_text, char_length = EXCLUDED.char_length,
                 enqueued_at = NOW(), completed_at = NULL, failed_at = NULL, attempts = 0
-        """, (source, text[:50000], len(text)))
+        """, (source, text, len(text)))
         cur.execute("""
             UPDATE ingest_failures SET retry_count = retry_count + 1, last_failed_at = NOW()
             WHERE source = %s