Add unit tests for VexLens normalizer, CPE parser, product mapper, and PURL parser

- Implemented comprehensive tests for VexLensNormalizer including format detection and normalization scenarios.
- Added tests for CpeParser covering CPE 2.3 and 2.2 formats, invalid inputs, and canonical key generation.
- Created tests for ProductMapper to validate parsing and matching logic across different strictness levels.
- Developed tests for PurlParser to ensure correct parsing of various PURL formats and validation of identifiers.
- Introduced stubs for Monaco editor and worker to facilitate testing in the web application.
- Updated project file for the test project to include necessary dependencies.

.claude/settings.local.json

@@ -12,7 +12,9 @@
       "Bash(copy:*)",
       "Bash(dotnet test:*)",
       "Bash(dir:*)",
-      "Bash(Select-Object -ExpandProperty FullName)"
+      "Bash(Select-Object -ExpandProperty FullName)",
+      "Bash(echo:*)",
+      "Bash(Out-File -FilePath \"E:\\dev\\git.stella-ops.org\\src\\Scanner\\__Libraries\\StellaOps.Scanner.Surface\\StellaOps.Scanner.Surface.csproj\" -Encoding utf8)"
     ],
     "deny": [],
     "ask": []