Code review fixes: CV pinning, F1 (excluded_sources), F14 (50KB truncation), F37

- api.py: strip CV pinning workaround (parity violation, see architecture doc)
- dream.py: F1 — retrieve_graphiti() now accepts excluded_sources, over-fetches
  3x and filters in-process. Was silently dropping the parameter; would have
  confounded E3 with broken cross-stage exclusion in Graphiti arm.
- watcher.py + ingest.py: F14 — drop full_text[:50000] truncation. Was
  propagating through entire cascade. Postgres TEXT can hold up to 1GB.
- corpus_integrity.py: F37 — same truncation, third path now clean.

Backups: api.py.bak.*, dream.py.bak.*, watcher.py.bak.*, ingest.py.bak.*,
corpus_integrity.py.bak.* timestamped pre-fix.

Re-cascaded Shop Class as Soulcraft (only already-cascaded source affected
by F14, 414KB).

scripts/corpus_integrity.py

@@ -135,7 +135,7 @@ def queue_for_retry(source, full_text, filepath):
             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, full_text[:50000], len(full_text)))
+        """, (source, full_text, len(full_text)))
         pg.commit()
         pg.close()
         return True