fix(3536): silence source-grep lint on config-schema parity test

The SDK side of the parity test asserts the source shape of
sdk/src/query/config-schema.ts (must re-export from
../configuration/index.js; must NOT contain inline `new Set([...])`
literals). Runtime/IR comparison cannot distinguish a re-export from
a redeclared Set with identical contents — only source inspection
catches drift back to inline literals.

Adds the documented `// allow-test-rule:` annotation explaining why
the three `src.includes()` calls are structurally necessary. Test
behavior unchanged; all 6 tests still pass; lint-no-source-grep now
reports 0 violations across 514 test files.

tests/config-schema-sdk-parity.test.cjs

@@ -1,5 +1,11 @@
 'use strict';
 
+// allow-test-rule: structural source assertion — verifies that sdk/src/query/config-schema.ts
+// is a re-export shell (no inline literals) rather than a redeclared Set. Runtime/IR comparison
+// cannot distinguish a re-export from a redeclared `new Set([...])` with identical contents
+// because both would deep-equal the manifest set; only source-shape inspection catches drift
+// back to inline literals. See test "SDK config-schema.ts re-exports from configuration module".
+
 /**
  * Manifest-as-source-of-truth guard (Phase 2, Cycle 5, #3536).
  *