Add tests for SBOM generation determinism across multiple formats

- Created `StellaOps.TestKit.Tests` project for unit tests related to determinism.
- Implemented `DeterminismManifestTests` to validate deterministic output for canonical bytes and strings, file read/write operations, and error handling for invalid schema versions.
- Added `SbomDeterminismTests` to ensure identical inputs produce consistent SBOMs across SPDX 3.0.1 and CycloneDX 1.6/1.7 formats, including parallel execution tests.
- Updated project references in `StellaOps.Integration.Determinism` to include the new determinism testing library.

docs2/data/postgresql-operations.md

@@ -0,0 +1,36 @@
+# PostgreSQL operations
+
+Purpose
+- Operate the canonical PostgreSQL control plane with deterministic behavior.
+
+Schema topology
+- Per-module schemas: authority, vuln, vex, scheduler, notify, policy, concelier, audit.
+- Tenant isolation enforced via tenant_id and RLS policies.
+
+Performance setup
+- Enable pg_stat_statements for query analysis.
+- Tune shared_buffers, effective_cache_size, work_mem, and WAL sizes per host.
+- Use PgBouncer in transaction pooling mode for high concurrency.
+
+Session defaults
+- SET app.tenant_id per connection.
+- SET timezone to UTC.
+- Enforce statement_timeout for long-running queries.
+
+Query analysis
+- Use pg_stat_statements to find high total and high mean latency queries.
+- Use EXPLAIN ANALYZE with BUFFERS to detect missing indexes.
+
+Backups and restore
+- Use scheduled logical or physical backups with tested restore paths.
+- Keep PITR capability where required by retention policies.
+- Validate backups with deterministic restore tests.
+
+Monitoring
+- Track connection count, replication lag, and slow query rates.
+- Alert on pool saturation and replication delays.
+
+Related references
+- data/postgresql-patterns.md
+- data/persistence.md
+- docs/operations/postgresql-guide.md