Add signal contracts for reachability, exploitability, trust, and unknown symbols

- Introduced `ReachabilityState`, `RuntimeHit`, `ExploitabilitySignal`, `ReachabilitySignal`, `SignalEnvelope`, `SignalType`, `TrustSignal`, and `UnknownSymbolSignal` records to define various signal types and their properties.
- Implemented JSON serialization attributes for proper data interchange.
- Created project files for the new signal contracts library and corresponding test projects.
- Added deterministic test fixtures for micro-interaction testing.
- Included cryptographic keys for secure operations with cosign.

src/Web/StellaOps.Web/package.json

@@ -13,8 +13,8 @@
     "serve:test": "ng serve --configuration development --port 4400 --host 127.0.0.1",
     "verify:chromium": "node ./scripts/verify-chromium.js",
     "ci:install": "npm ci --prefer-offline --no-audit --no-fund",
-    "storybook": "storybook dev -p 4600",
-    "storybook:build": "storybook build",
+    "storybook": "ng run stellaops-web:storybook",
+    "storybook:build": "ng run stellaops-web:build-storybook",
     "test:a11y": "FAIL_ON_A11Y=0 playwright test tests/e2e/a11y-smoke.spec.ts"
   },
   "engines": {
@@ -45,7 +45,6 @@
     "@storybook/addon-essentials": "8.1.0",
     "@storybook/addon-interactions": "8.1.0",
     "@storybook/angular": "8.1.0",
-    "@storybook/angular-renderer": "8.1.0",
     "@storybook/test": "8.1.0",
     "@storybook/testing-library": "0.2.2",
     "storybook": "8.1.0",