feat(validators): add noqa suppression support to security and performance validators

- Add centralized _is_noqa_suppressed() to BaseValidator with normalization
  (accepts both SEC001 and SEC-001 formats for ruff compatibility)
- Wire noqa support into all 21 security and 18 performance check functions
- Add ruff external config for SEC/PERF/MOD/EXC codes in pyproject.toml
- Convert all 280 Python noqa comments to dashless format (ruff-compatible)
- Add site/ to IGNORE_PATTERNS (excludes mkdocs build output)
- Suppress 152 false positive findings (test passwords, seed data, validator
  self-references, Apple Wallet SHA1, etc.)
- Security: 79 errors → 0, 60 warnings → 0
- Performance: 80 warnings → 77 (3 test script suppressions)
- Add proposal doc with noqa inventory and remaining findings recommendations

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

mkdocs.yml

@@ -233,6 +233,7 @@ nav:
       - Loyalty Phase 2 Interfaces: proposals/loyalty-phase2-interfaces-plan.md
       - Loyalty Program Analysis: proposals/loyalty-program-analysis.md
       - Permissions Plan: proposals/plan-perms.md
+      - Validator Noqa & Remaining Findings: proposals/validator-noqa-suppressions-and-remaining-findings.md
 
     # --- Archive ---
     - Archive: