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/data/persistence.md

@@ -0,0 +1,34 @@
+# Persistence and database
+
+StellaOps uses PostgreSQL as the canonical system of record. This document
+summarizes the persistence rules, schema layout, and migration approach.
+
+Principles
+- Determinism first: stable ordering, UTC timestamps, canonical JSON for hashes.
+- Tenant isolation: every row carries tenant_id and row level security is used.
+- Gradual migration: Mongo to Postgres via a strangler approach with rollback.
+- JSONB for flexibility: semi structured payloads stay JSONB; core entities are normalized.
+
+Schema families (authoritative DDLs)
+- authority, vuln, vex, scheduler, notify, policy
+- packs are included with policy
+- issuer and audit are staged or proposed
+
+Operational inputs
+- Config template: docs/db/persistence-config-template.yaml
+- Cluster provisioning: docs/db/cluster-provisioning.md
+- Local dev: docs/db/local-postgres.md
+
+Change control and verification
+- Follow rules in docs/db/RULES.md for naming, constraints, and RLS.
+- Use docs/db/SPECIFICATION.md as the schema source of truth.
+- Verify changes using docs/db/VERIFICATION.md before release.
+
+Migration notes
+- Conversion planning: docs/db/CONVERSION_PLAN.md
+- Module phased tasks: docs/db/tasks/PHASE_*.md
+- Reports and verification evidence live under docs/db/reports/
+
+Related references
+- ADR: docs/adr/0001-postgresql-for-control-plane.md
+- Module architecture: docs/modules/*/architecture.md