Follow-up to the Phases 1-2-4 modernization PR.
- models.py: extend retry coverage to Gemini transient errors
(google.api_core: ResourceExhausted, InternalServerError,
ServiceUnavailable, DeadlineExceeded, GatewayTimeout). Before this,
a 429 or 5xx from Google would crash the scanner route. Retriable
count went from 6 to 11.
- retriever.py: batch cache-miss embeddings into a single
embed_documents() call instead of one embed_query() per memory.
Cold rebuild of 87 memories went from ~30s to ~10s; one HTTPS
round-trip instead of 87.
- telemetry.py + scripts/weekly_summary.py: use UTC date for log
filenames so they align with the UTC `timestamp` field inside each
record. Eliminates the off-by-one near local midnight and matches
Sea Haven's UTC-for-logs convention.
- scripts/weekly_summary.py: include failed runs in the total cost
estimate (they consumed tokens too) and surface a `(incl. $X on
failed runs)` breakdown so outages are visible in the digest.
Validated: ruff clean; weekly_summary.py still prints; retriever cold
rebuild + cache hit both verified end-to-end.
