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>

scripts/validate/validate_audit.py

@@ -196,7 +196,7 @@ class AuditValidator(BaseValidator):
                 r"logger\.\w+\(.*password\s*[=:]\s*['\"]?%",  # password=%s
                 r"logger\.\w+\(.*password\s*[=:]\s*\{",  # password={var}
                 r"logging\.\w+\(.*password\s*[=:]\s*['\"]?%",  # password=%s
-                r"print\(.*password\s*=",  # print(password=xxx)  # noqa: SEC-021
+                r"print\(.*password\s*=",  # print(password=xxx)  # noqa: SEC021
                 r"logger.*credit.*card.*\d",  # credit card with numbers
                 r"logger.*\bssn\b.*\d",  # SSN with numbers
             ],
@@ -390,7 +390,7 @@ class AuditValidator(BaseValidator):
         pyproject = self.project_root / "pyproject.toml"
         if pyproject.exists():
             content = pyproject.read_text()
-            if "http://" in content and "https://" not in content:
+            if "http://" in content and "https://" not in content:  # noqa: SEC034
                 self.add_error(
                     "THIRD-VEND-001",
                     "Only HTTPS sources allowed for packages",