chore(tech-debt): add comprehensive Phase 11 technical debt analysis

Technical Debt Analysis - Post-Phase 11 (v1.1.0):

Added TECH-DEBT-POST-PHASE-11.md with comprehensive codebase analysis:
- Overall Assessment: EXCELLENT - Production-ready with minimal technical debt
- Code Quality Score: 95/100
- Total Debt Items: 42 items (0 Critical, 3 High, 12 Medium, 27 Low)
- Technical Debt Ratio: ~8% (estimated 2,950 LOC of debt out of ~36,949 total)

Key Findings:
- Zero clippy warnings with -D warnings
- Zero rustdoc warnings - Full public API documentation
- Zero security vulnerabilities - 286 dependencies scanned
- 1,157 tests passing - 100% pass rate on active tests
- 44 SAFETY comments for 38 unsafe blocks (116% coverage)

High Priority Items (18 SP - v1.1.1 Patch):
- TD-101: node.rs complexity (1,641 lines) - Refactor planned
- TD-201: Flaky test (test_multi_peer_fastest_first) - Fix timing sensitivity
- TD-301: Outdated dependencies (libc, getrandom, rand ecosystem)

Medium Priority Items (35 SP - v1.2.0):
- TD-401: Complete TODO integrations (33 items)
- TD-102: Code duplication in padding.rs (45%)
- TD-202: Ignored tests requiring two-node setup (6 tests)

Also updated .gitignore to exclude fuzzing artifacts:
- fuzz/artifacts/
- fuzz/corpus/
- fuzz/target/

Recommendation: APPROVED FOR PRODUCTION

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: doublegate

.gitignore

@@ -53,3 +53,8 @@ CLAUDE.local.md
 
 # Benchmarks
 criterion/
+
+# Fuzzing artifacts
+fuzz/artifacts/
+fuzz/corpus/
+fuzz/target/