Feature/pr intent scan hardening (#375)

* security: harden suspicious PR intent scanner

* security: reduce pr scanner false positives

package.json

@@ -34,6 +34,7 @@
     "test": "bun test",
     "test:coverage": "bun test --coverage --coverage-reporter=lcov --coverage-dir=coverage --max-concurrency=1 && bun run scripts/render-coverage-heatmap.ts",
     "test:coverage:ui": "bun run scripts/render-coverage-heatmap.ts",
+    "security:pr-scan": "bun run scripts/pr-intent-scan.ts",
     "test:provider-recommendation": "bun test src/utils/providerRecommendation.test.ts src/utils/providerProfile.test.ts",
     "typecheck": "tsc --noEmit",
     "smoke": "bun run build && node dist/cli.mjs --version",