Sites L432 (cleanup) and L450 (reset_session) had:
try: _gemini_client.caches.delete(name=_gemini_cache.name)
except Exception: pass
This is bare 'except: pass' = INTERNAL_SILENT_SWALLOW violation (logging is NOT
a drain; 'pass' is the worst form of silent recovery).
Migration: use existing _delete_gemini_cache_result() helper (added Phase 10).
The helper returns Result[None]; on SDK error logs a warning to comms.
The caller ignores the Result (cleanup is best-effort).
Audit: ai_client SS 11 -> 9.
ed
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