Add inline DSSE provenance documentation and Mongo schema

- Introduced a new document outlining the inline DSSE provenance for SBOM, VEX, scan, and derived events.
- Defined the Mongo schema for event patches, including key fields for provenance and trust verification.
- Documented the write path for ingesting provenance metadata and backfilling historical events.
- Created CI/CD snippets for uploading DSSE attestations and generating provenance metadata.
- Established Mongo indexes for efficient provenance queries and provided query recipes for various use cases.
- Outlined policy gates for managing VEX decisions based on provenance verification.
- Included UI nudges for displaying provenance information and implementation tasks for future enhancements.

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Implement reachability lattice and scoring model

- Developed a comprehensive document detailing the reachability lattice and scoring model.
- Defined core types for reachability states, evidence, and mitigations with corresponding C# models.
- Established a scoring policy with base score contributions from various evidence classes.
- Mapped reachability states to VEX gates and provided a clear overview of evidence sources.
- Documented the event graph schema for persisting reachability data in MongoDB.
- Outlined the integration of runtime probes for evidence collection and defined a roadmap for future tasks.

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Introduce uncertainty states and entropy scoring

- Created a draft document for tracking uncertainty states and their impact on risk scoring.
- Defined core uncertainty states with associated entropy values and evidence requirements.
- Established a schema for storing uncertainty states alongside findings.
- Documented the risk score calculation incorporating uncertainty and its effect on final risk assessments.
- Provided policy guidelines for handling uncertainty in decision-making processes.
- Outlined UI guidelines for displaying uncertainty information and suggested remediation actions.

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Add Ruby package inventory management

- Implemented Ruby package inventory management with corresponding data models and storage mechanisms.
- Created C# records for Ruby package inventory, artifacts, provenance, and runtime details.
- Developed a repository for managing Ruby package inventory documents in MongoDB.
- Implemented a service for storing and retrieving Ruby package inventories.
- Added unit tests for the Ruby package inventory store to ensure functionality and data integrity.

docs/modules/policy/architecture.md

@@ -19,10 +19,11 @@ The service operates strictly downstream of the **Aggregation-Only Contract (AOC
 - Join SBOM inventory, Concelier advisories, and Excititor VEX evidence via canonical linksets and equivalence tables.
 - Materialise effective findings (`effective_finding_{policyId}`) with append-only history and produce explain traces.
 - Emit per-finding OpenVEX decisions anchored to reachability evidence, forward them to Signer/Attestor for DSSE/Rekor, and publish the resulting artifacts for bench/verification consumers.
+- Consume reachability lattice decisions (`ReachDecision`, `docs/reachability/lattice.md`) to drive confidence-based VEX gates (not_affected / under_investigation / affected) and record the policy hash used for each decision.
 - Operate incrementally: react to change streams (advisory/vex/SBOM deltas) with ≤ 5 min SLA.
 - Provide simulations with diff summaries for UI/CLI workflows without modifying state.
 - Enforce strict determinism guard (no wall-clock, RNG, network beyond allow-listed services) and RBAC + tenancy via Authority scopes.
-- Support sealed/air-gapped deployments with offline bundles and sealed-mode hints.
+- Support sealed/air-gapped deployments with offline bundles and sealed-mode hints.
 
 Non-goals: policy authoring UI (handled by Console), ingestion or advisory normalisation (Concelier), VEX consensus (Excititor), runtime enforcement (Zastava).