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/2025-10-19-scheduler-storage.md

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+# Scheduler Storage Update — 2025-10-19
+
+**Subject:** Mongo bootstrap + canonical fixtures  
+**Audience:** Scheduler Storage Guild, Scheduler WebService/Worker teams
+
+- Added `StellaOps.Scheduler.Storage.Mongo` bootstrap (`AddSchedulerMongoStorage`) with collection/index migrations for schedules, runs (incl. TTL), impact snapshots, audit, and locks.
+- Introduced Mongo2Go-backed tests that round-trip the published scheduler samples (`samples/api/scheduler/*.json`) to ensure canonical JSON stays intact.
+- `ISchedulerMongoInitializer.EnsureMigrationsAsync` now provides the single entry point for WebService/Worker hosts to apply migrations at startup.