fix(experiment): report retained string source scope explicitly

Co-authored-by: gensokyo-dev <342580529+gensokyo-dev@users.noreply.github.com>
Co-authored-by: Kaoru0822 <208281322+kaoru0822-kitauji@users.noreply.github.com>

experiments/atomic-codemode/native-string-query-study.md

@@ -232,3 +232,24 @@ Additional local anchors (SHA-256):
 - `llvm-native-query-codemode-v1/summary.json`: `cf4ceed764ca57a2ec6d6532b2b5958c7702500b29e02d775656fe5f338dcc2f`.
 - `native-string-query-question.txt`: `2738574ab764afa95ddb0678f51c6b8cfa67946989f7270d7b13d77a6090eccf`.
 - `native-string-query-oracle.md`: `a3e18a3fe512c5bf1a809ac9b12c1f17beb85786925d8bd887d86ab58c63b76b`.
+
+## Source-scope consistency follow-up
+
+Final contract review found that the legacy inventory selector omitted
+`coverage.source_scope`, while the new query owner reported it explicitly. The
+shared legacy selector now emits `whole native inventory`, examined row count
+and `literal_utf16` matching, so callers do not have to infer report scope from
+acquisition mode or an absent field. Artifact discovery remains unknown. The
+native query path and the frozen model outcomes above are unchanged.
+
+The existing real FFmpeg verifier now asserts this source scope and all 60,601
+examined rows. SDK, Direct MCP and Code Mode all pass, including complete raw
+Evidence, selected values/bytes, repeated reads and stale handles. Changed-file
+lint and formatting pass. This small additive metadata follow-up has no new
+model-token measurement; the table records complete real verifier costs.
+
+| Scope follow-up verifier | Wall s | Family CPU s | Kernel family peak MiB |
+| ------------------------ | -----: | -----------: | ---------------------: |
+| sdk                      |  7.068 |     6.751094 |                  347.1 |
+| direct                   |  7.168 |     6.977332 |                  417.6 |
+| codemode                 |  7.468 |     7.185083 |                  435.9 |

experiments/atomic-codemode/string-facts.mjs

@@ -9,6 +9,9 @@ export const selectStringFacts = (inventory, input) => ({
   coverage: {
     scope: "native string inventory, minimum 5",
     scanned: inventory.scanned,
+    examined: inventory.items.length,
+    matching: "literal_utf16",
+    source_scope: "whole native inventory",
     artifact_discovery: "unknown",
     reference_attribution: "not-computed",
   },

experiments/atomic-codemode/verify-streamed-inventory.mjs

@@ -112,6 +112,8 @@ try {
     assert(r.ok);
     assert.equal(r.context.lease, context.lease);
     assert.equal(r.data.total, 1);
+    assert.equal(r.data.coverage.source_scope, "whole native inventory");
+    assert.equal(r.data.coverage.examined, 60601);
     assert.equal(r.data.items.length, 1);
     const row = r.data.items[0];
     assert.equal(row.address, fixture.address);