feat: Add comprehensive product advisories for improved scanner functionality

- Introduced a blueprint for explainable quiet alerts, detailing phases for SBOM, VEX readiness, and attestations.
- Developed a roadmap for deterministic diff-aware rescans, enhancing scanner speed and efficiency.
- Implemented a hash-based SBOM layer cache to optimize container scans by reusing previous results.
- Created a multi-runtime reachability corpus to validate function-level reachability across various programming languages.
- Proposed a stable SBOM model using SPDX 3.0.1 for persistence and CycloneDX 1.6 for interchange.
- Established a validation plan for quiet scans, focusing on provenance and CI integration.
- Documented guidelines for the Findings Ledger module, outlining roles, execution rules, and testing protocols.

docs/implplan/archived/updates/2025-10-29-notify-docs.md

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+# 2025-10-29 – Notifications Studio docs sync prep
+
+## Summary
+- Published Notifications Studio overview (`notifications/overview.md`) and architecture dossier (`notifications/architecture.md`), complementing the rules/templates/digests deep dives landed earlier in Sprint 39.
+- Captured action items to validate connector metadata, quiet-hours semantics, and simulation endpoints once `NOTIFY-SVC-39-001..004` merge.
+- Alerted Notifications Service Guild that documentation handoff is pending those feature drops; ready to iterate as soon as the implementation surfaces schemas.
+
+## Follow-ups
+- [ ] Review merged notifier correlation/quiet-hours work (`NOTIFY-SVC-39-001..004`) and refresh overview + architecture docs with any new persistence/API details.
+- [ ] Coordinate with DevOps dashboards work (`DEVOPS-NOTIFY-39-002`) to document alert references once metrics names are finalised.