CRYPTO-PDF-METADATA-STABILITY (Deterministic Report Headers) & BIGQUERY-CLIENT-REFERENCE-HYGIENE (Deprecation Guard)

Release digest

CRYPTO-PDF-METADATA-STABILITY (Deterministic Report Headers) — Crypto PDF report titles now use the normalized payload generated_at date instead of runtime wall-clock time, keeping archived or regenerated reports stable across time zones and reruns.
BIGQUERY-CLIENT-REFERENCE-HYGIENE (Deprecation Guard) — The BigQuery analytics client now builds explicit DatasetReference and TableReference objects instead of the deprecated Client.dataset() helper.

Added PDF contract coverage for payload-driven report title dates.
Added BigQuery client contract coverage that fails if the deprecated Client.dataset() path is reintroduced.
Re-ran the full Python suite locally: 872 passed, 2 skipped, 22 deselected.
No public documentation update required beyond this changelog entry because the patch stabilizes report metadata and internal BigQuery client references without changing the visible PDF section model or public API surface.