test: harden verification fixtures and runtime coverage

Use exact discovered test identities, production MCP sessions and byte-exact setup backups. Add CLI signal cleanup coverage and independent Ghidra, Go and firmware verification assertions; prune redundant test configuration and preserve platform limits.

.github/workflows/ci.yml

@@ -634,6 +634,7 @@ jobs:
           tests/boundary/cli/nativeSignatureCli.test.ts
           tests/boundary/mcp/nativeSignatureTargetBindingMcp.test.ts
           src/process/capture/FilesystemSnapshot.test.ts
+          tests/process-global/filesystemSnapshotFallbackCancellation.test.ts
           tests/boundary/process/darwinProcessRunTokenReader.test.ts
           tests/boundary/process/directAnalysisSignals.test.ts
           tests/boundary/process/processCaptureLifecycle.test.ts
@@ -714,6 +715,8 @@ jobs:
       - name: Run curated Windows capability tests
         run: >-
           npx vitest run --coverage.enabled=false
+          src/process/capture/FilesystemSnapshot.test.ts
+          tests/process-global/filesystemSnapshotFallbackCancellation.test.ts
           tests/boundary/filesystem/binaryTarget.test.ts
           tests/boundary/filesystem/safeOutputTree.test.ts
           tests/boundary/providers/native/artifactProvider.archiveSafety.test.ts