feat: Add UI benchmark driver and scenarios for graph interactions

- Introduced `ui_bench_driver.mjs` to read scenarios and fixture manifest, generating a deterministic run plan.
- Created `ui_bench_plan.md` outlining the purpose, scope, and next steps for the benchmark.
- Added `ui_bench_scenarios.json` containing various scenarios for graph UI interactions.
- Implemented tests for CLI commands, ensuring bundle verification and telemetry defaults.
- Developed schemas for orchestrator components, including replay manifests and event envelopes.
- Added mock API for risk management, including listing and statistics functionalities.
- Implemented models for risk profiles and query options to support the new API.

docs/modules/cli/contracts/output-determinism.md

@@ -0,0 +1,19 @@
+# CLI Output Determinism Policy (v1) — 2025-12-01
+
+Scope: `StellaOps.Cli` JSON/table/markdown outputs for advisory verbs and auth doctor.
+
+Rules
+- Time: All timestamps UTC; no local timezone conversion.
+- Locale: `en-US`, `InvariantCulture` for number/date formatting.
+- Ordering: Sort collections by stable key (id/name) before rendering; JSON keys stable-sorted.
+- Width: Table renderer clamps to width 80; no ANSI when `--output json` or non-TTY.
+- Seeds: Randomness forbidden; no wall-clock in hashes; use provided deterministic IDs.
+
+Tests
+- Golden fixtures stored under `src/Cli/__Tests/StellaOps.Cli.Tests/Fixtures/output-determinism/`.
+- Hash check: two consecutive runs of the same command with identical inputs must produce identical SHA256 of stdout.
+- Locale guard: integration test forces `CultureInfo("fr-FR")` and asserts output matches fixtures.
+
+Failure handling
+- Any drift fails CI; diff is printed with unified format.
+- Add new fields behind explicit versioned spec entry in `cli-spec-v1.yaml`.