feat: Add VEX compact fixture and implement offline verifier for Findings Ledger exports

- Introduced a new VEX compact fixture for testing purposes.
- Implemented `verify_export.py` script to validate Findings Ledger exports, ensuring deterministic ordering and applying redaction manifests.
- Added a lightweight stub `HarnessRunner` for unit tests to validate ledger hashing expectations.
- Documented tasks related to the Mirror Creator.
- Created models for entropy signals and implemented the `EntropyPenaltyCalculator` to compute penalties based on scanner outputs.
- Developed unit tests for `EntropyPenaltyCalculator` to ensure correct penalty calculations and handling of edge cases.
- Added tests for symbol ID normalization in the reachability scanner.
- Enhanced console status service with comprehensive unit tests for connection handling and error recovery.
- Included Cosign tool version 2.6.0 with checksums for various platforms.

src/Bench/StellaOps.Bench/Graph/ui_bench_driver.test.mjs

@@ -0,0 +1,42 @@
+import assert from "node:assert";
+import { test } from "node:test";
+import fs from "node:fs";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+import { spawnSync } from "node:child_process";
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+
+test("ui bench driver emits overlay + seed metadata", () => {
+  const tmp = fs.mkdtempSync(path.join(process.cwd(), "tmp-ui-bench-"));
+  const fixtureDir = path.join(tmp, "fixture");
+  fs.mkdirSync(fixtureDir, { recursive: true });
+
+  // minimal fixture files
+  fs.writeFileSync(path.join(fixtureDir, "manifest.json"), JSON.stringify({ hashes: { nodes: "abc" } }));
+  fs.writeFileSync(path.join(fixtureDir, "overlay.ndjson"), "{\"source\":\"a\",\"target\":\"b\"}\n");
+
+  const scenariosPath = path.join(tmp, "scenarios.json");
+  fs.writeFileSync(
+    scenariosPath,
+    JSON.stringify({ version: "1.0.0", scenarios: [{ id: "load", name: "Load", steps: ["navigate"] }] })
+  );
+
+  const outputPath = path.join(tmp, "plan.json");
+  const env = { ...process.env, UI_BENCH_SEED: "1337", UI_BENCH_TRACE_ID: "trace-test" };
+  const driverPath = path.join(__dirname, "ui_bench_driver.mjs");
+  const result = spawnSync(process.execPath, [driverPath, fixtureDir, scenariosPath, outputPath], { env });
+  assert.strictEqual(result.status, 0, result.stderr?.toString());
+
+  const plan = JSON.parse(fs.readFileSync(outputPath, "utf-8"));
+  assert.strictEqual(plan.fixture, "fixture");
+  assert.strictEqual(plan.seed, "1337");
+  assert.strictEqual(plan.traceId, "trace-test");
+  assert.ok(plan.overlay);
+  assert.ok(plan.overlay.path.endsWith("overlay.ndjson"));
+  assert.ok(plan.overlay.sha256);
+  assert.deepStrictEqual(plan.viewport, { width: 1280, height: 720, deviceScaleFactor: 1 });
+
+  fs.rmSync(tmp, { recursive: true, force: true });
+});