fix: resolve critical validation issues in OSSA pipeline

• Add missing 4XX responses to OpenAPI callback operations
• Remove unused imports in ossa-cli.ts (mkdirSync, resolve, extname, execSync)
• Fix TypeScript compilation error (orphaned closing brace)
• Add ESLint disable comments for necessary console.log statements
• Update TypeScript any types to unknown for better type safety

Validation status:

• Build: ✅ PASSING (TypeScript compilation successful)
• OpenAPI: ✅ PASSING (4XX response requirement fixed)
• Pipeline: Ready for CI/CD execution