docs: Archive Sprint 3500 (PoE), Sprint 7100 (Proof Moats), and additional sprints

Archive completed sprint documentation and deliverables:

## SPRINT_3500 - Proof of Exposure (PoE) Implementation (COMPLETE ✅)
- Windows filesystem hash sanitization (colon → underscore)
- Namespace conflict resolution (Subgraph → PoESubgraph)
- Mock test improvements with It.IsAny<>()
- Direct orchestrator unit tests
- 8/8 PoE tests passing (100% success)
- Archived to: docs/implplan/archived/2025-12-23-sprint-3500-poe/

## SPRINT_7100.0001 - Proof-Driven Moats Core (COMPLETE ✅)
- Four-tier backport detection system
- 9 production modules (4,044 LOC)
- Binary fingerprinting (TLSH + instruction hashing)
- VEX integration with proof-carrying verdicts
- 42+ unit tests passing (100% success)
- Archived to: docs/implplan/archived/2025-12-23-sprint-7100-proof-moats/

## SPRINT_7100.0002 - Proof Moats Storage Layer (COMPLETE ✅)
- PostgreSQL repository implementations
- Database migrations (4 evidence tables + audit)
- Test data seed scripts (12 evidence records, 3 CVEs)
- Integration tests with Testcontainers
- <100ms proof generation performance
- Archived to: docs/implplan/archived/2025-12-23-sprint-7100-proof-moats/

## SPRINT_3000_0200 - Authority Admin & Branding (COMPLETE ✅)
- Console admin RBAC UI components
- Branding editor with tenant isolation
- Authority backend endpoints
- Archived to: docs/implplan/archived/

## Additional Documentation
- CLI command reference and compliance guides
- Module architecture docs (26 modules documented)
- Data schemas and contracts
- Operations runbooks
- Security risk models
- Product roadmap

All archived sprints achieved 100% completion of planned deliverables.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

docs2/security/forensics-and-evidence-locker.md

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+# Forensics and evidence locker
+
+The evidence locker is a WORM friendly store for audit and forensic artifacts
+such as bundles, logs, and attestations.
+
+Storage model
+- Object storage with immutable retention and versioning.
+- PostgreSQL index with metadata and retention fields.
+
+Ingest rules
+- Append only, content addressed paths.
+- Require tenant, hash, size, and provenance.
+- Reject partial uploads or missing signatures.
+
+Retention and legal hold
+- Default retention per tenant.
+- Legal hold blocks deletion until cleared by approval.
+- Daily retention job emits audit logs.
+
+Access and verification
+- RBAC scopes for read, write, and legal hold.
+- Verify hashes and DSSE signatures on demand.
+- Background sampling emits failure events.
+
+Minimum bundle layout
+- manifest.json with hashes and provenance
+- data/ payloads
+- signatures/ for DSSE or sigstore bundles
+
+Related references
+- docs/forensics/evidence-locker.md
+- docs/forensics/provenance-attestation.md
+- docs/evidence-locker/evidence-pack-schema.md

docs2/security/risk-model.md

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+# Risk model and scoring
+
+Risk scoring turns evidence into a normalized score and severity band. The
+model is deterministic and explainable.
+
+Core concepts
+- Signals become evidence after validation.
+- Evidence is normalized into factors.
+- Profiles define weights, thresholds, and overrides.
+- Formulas aggregate factors into scores and severity.
+
+Lifecycle
+1. Job submit with tenant, profile, and findings.
+2. Evidence ingestion from scanners, reachability, and VEX.
+3. Normalization and dedupe by provenance hash.
+4. Profile evaluation with gates and overrides.
+5. Severity assignment and explainability output.
+6. Export to Findings Ledger and Export Center.
+
+Artifacts
+- Profile schema: signals, weights, overrides, provenance.
+- Job and result schema: score, severity, contributions.
+- Explainability payloads for UI and CLI.
+
+Determinism rules
+- Stable ordering for factors and signals.
+- Fixed precision math and UTC timestamps.
+- Hashes and provenance recorded for every input.
+
+Related references
+- docs/risk/overview.md
+- docs/risk/factors.md
+- docs/risk/formulas.md
+- docs/risk/profiles.md
+- docs/risk/api.md