Complete SDLC Phase 5: Resolve open issues found during audit

[sfloess]

Part of #431: Complete SDLC automation and fix classloader-java API compatibility

Problem

SDLC Phase 5 (issue resolution) was never executed because Phase 4 was interrupted.

Tasks

• Triage issues found during security audit and earlier SDLC phases
• Fix or create tracking issues for all findings
• Verify fixes compile and pass tests
• Re-run relevant checks to confirm resolution

Acceptance Criteria

• All issues from Phases 1-4 are resolved or have tracking issues
• Codebase compiles cleanly
• All tests pass