fix(lint): use plain comments for architecture validator codes

Replace # noqa: SVC-006 with # SVC-006 to avoid ruff warnings about
unknown codes. Updated architecture validators to match the new format
by checking for the code string directly instead of the noqa: prefix.

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

pyproject.toml

@@ -35,9 +35,6 @@ exclude = [
 ]
 
 [tool.ruff.lint]
-# Allow custom architecture validator codes in # noqa directives (e.g., SEC-034, SVC-006)
-external = ["SEC", "SVC", "MOD", "API", "ARCH", "PERF"]
-
 # Enable comprehensive rule sets
 select = [
     "E",     # pycodestyle errors