fix(browser): clarify shared source-map output budget (#9154)

* fix(browser): clarify shared source-map output budget

* test(browser): assert source-map budget facts independently

* test(process): align symlink fixture with filesystem checkpoints

* test(frida): assert the CLI spawn Evidence contract

* test(mcp): use an unsupported analysis-view parent

* test(browser): separate source-location line bounds from parity

src/browser/WebSourceMapFetcher.ts

@@ -666,7 +666,7 @@ const normalizeSourceMap = (
     return emptySourceMapItem(
       request,
       "fetch_failed",
-      "Source-map response text exceeds the 32 MiB source-map output budget; JSON parsing and source-map decoding were not attempted.",
+      "JSON-escaped response text and map metadata would exceed the remaining space in the shared 32 MiB source-map output budget; JSON parsing and source-map decoding were not attempted.",
       fetchedUrl,
       responseIdentity,
     );

tests/boundary/browser/webSourceMapResponseIdentity.test.ts

@@ -193,6 +193,11 @@ it("refuses oversized text before JSON interpretation while retaining body ident
       { status: "included", artifact: { text: valid }, mappings: [{}] },
     ],
   });
+  const limitation = result.value.items[0]?.limitation;
+  expect(limitation).toMatch(/JSON[- ]escap/i);
+  expect(limitation).toMatch(/metadata/i);
+  expect(limitation).toMatch(/shared/i);
+  expect(limitation).toMatch(/32\s*MiB/i);
   expect(Buffer.byteLength(JSON.stringify(result.value))).toBeLessThanOrEqual(
     32 * 1024 * 1024,
   );