chore: resolve critical cognitive complexity issues

- Refactored 6 high-complexity functions into smaller helpers
- Fixed 4 unused parameter warnings
- Created technical debt documentation
- Improved code maintainability and readability

Files modified:
- cmd/simctl/main.go: simplified formatTestResult
- internal/adapters/iac/cloudformation/intrinsic.go: removed unused params
- internal/adapters/iac/cloudformation/parser.go: reduced complexity
- internal/report/chart_data.go: refactored heatmap generation
- internal/report/matching.go: simplified finding matching
- internal/sandbox/bridge.go: simplified runCommand
- tests/security/malicious_agent_test.go: refactored test structure

Documentation added:
- TECHNICAL-DEBT-REPORT.md: remaining linter issues
- LINTER-ISSUES-CATEGORIZED.md: categorized analysis
- DEEP-LINTER-ANALYSIS.md: comprehensive linter findings