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.

docs/_archive/console/observability.md

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+# Console Observability (stub)
+
+> Status: BLOCKED awaiting Observability Hub widget captures + deterministic sample payload hashes from Console Guild. This stub locks structure and checklist; replace placeholders once assets arrive.
+
+## Scope
+- Observability Hub widgets (traces, logs, metrics) for runtime/signals and graph overlays.
+- Accessibility and imposed rule banner.
+- Offline parity: all captures and sample payloads must be stored locally with SHA256 hashes.
+
+## Pending inputs (must be supplied before publish)
+- Widget screenshots or command-rendered outputs (deterministic capture).
+- Sample payloads (JSON/NDJSON) with hash list.
+- Alert rules/thresholds and dashboard import JSON.
+
+## Determinism checklist
+- Record all hashes in a `SHA256SUMS` alongside captures once provided.
+- Use UTC ISO-8601 timestamps and stable sort order for tables/output snippets.
+- Avoid external links; refer to local assets only.
+
+## Outline (to fill when unblocked)
+1. Overview and imposed rule banner
+2. Widget catalog (cards/tables) with captions
+3. Search/filter examples (logs, traces) with sample payloads
+4. Dashboards and alert thresholds (import JSON path)
+5. Accessibility and keyboard shortcuts
+6. Offline/air-gap import steps
+7. Verification steps (hash check + replay)