refactor(reference): derive import lookup from reader inventory

src/application/ReferenceSourceImport.ts

@@ -204,14 +204,8 @@ export const importReferenceSource = async (
   if (isAborted(options.signal)) return err(cancelled(readResult.value));
 
   const read = readResult.value;
-  const filePaths = new Set(
-    read.entries
-      .filter((entry) => entry.status === "read" && entry.kind === "file")
-      .map((entry) => entry.path),
-  );
-
   const { entries, relationships, parseFailures, limitations } =
-    parseReferenceSourceEntries(read, filePaths, exclusions, options.signal);
+    parseReferenceSourceEntries(read, exclusions, options.signal);
 
   if (isAborted(options.signal)) return err(cancelled(read));
 

src/application/ReferenceSourceImportEntries.test.ts

@@ -22,7 +22,7 @@ it("projects an unsupported non-regular entry as unknown kind instead of file",
     bytesRead: 0,
     limitations: [],
   };
-  const parsed = parseReferenceSourceEntries(read, new Set(), []);
+  const parsed = parseReferenceSourceEntries(read, []);
   expect(parsed.entries).toContainEqual({
     path: "src/pipe",
     kind: "unknown",
@@ -49,7 +49,7 @@ it("keeps a failed regular file as file kind", () => {
     bytesRead: 0,
     limitations: [],
   };
-  const parsed = parseReferenceSourceEntries(read, new Set(), []);
+  const parsed = parseReferenceSourceEntries(read, []);
   expect(parsed.entries).toContainEqual({
     path: "src/broken.ts",
     kind: "file",
@@ -85,11 +85,7 @@ it("keeps source entries when a module has an empty specifier", () => {
     limitations: [],
   };
 
-  const parsed = parseReferenceSourceEntries(
-    read,
-    new Set(files.map(([path]) => path)),
-    [],
-  );
+  const parsed = parseReferenceSourceEntries(read, []);
 
   expect(parsed.entries.map(({ path }) => path)).toEqual([
     "main.mjs",
@@ -134,11 +130,7 @@ it("retains Kotlin source identity and language across the inventory projection"
     ),
     limitations: [],
   };
-  const parsed = parseReferenceSourceEntries(
-    read,
-    new Set(files.map(([path]) => path)),
-    [],
-  );
+  const parsed = parseReferenceSourceEntries(read, []);
   for (const [path, content, classifications, language] of files)
     expect(parsed.entries).toContainEqual({
       path,
@@ -206,11 +198,7 @@ it("resolves declared package mains and index fallback from source-owned fields"
       writable: true,
       value: "phantom.js",
     });
-    parsed = parseReferenceSourceEntries(
-      read,
-      new Set(files.map(([path]) => path)),
-      [],
-    );
+    parsed = parseReferenceSourceEntries(read, []);
   } finally {
     if (previous === undefined)
       Reflect.deleteProperty(Object.prototype, "main");
@@ -307,11 +295,7 @@ it("matches package manifests by exact or unique canonical directory identity",
     limitations: [],
   };
 
-  const parsed = parseReferenceSourceEntries(
-    read,
-    new Set(files.map(([path]) => path)),
-    [],
-  );
+  const parsed = parseReferenceSourceEntries(read, []);
 
   expect(parsed.relationships.map(({ to }) => to)).toEqual([
     `${decomposed}/unique.js`,
@@ -346,11 +330,7 @@ it("resolves extensionless imports and requires to .mts and .cts files and direc
     ),
     limitations: [],
   };
-  const parsed = parseReferenceSourceEntries(
-    read,
-    new Set(files.map(([path]) => path)),
-    [],
-  );
+  const parsed = parseReferenceSourceEntries(read, []);
   expect(parsed.relationships).toEqual(
     expect.arrayContaining([
       {

src/application/ReferenceSourceImportEntries.ts

@@ -534,7 +534,6 @@ const appendReadEntry = (
 /** Convert bounded reader observations into graph entries and parsed edges. */
 export const parseReferenceSourceEntries = (
   read: ReferenceSourceRead,
-  filePaths: ReadonlySet<string>,
   exclusions: HistoricalSourceGraphInput["exclusions"],
   signal?: AbortSignal,
 ): ParsedReferenceSourceEntries => {
@@ -550,7 +549,11 @@ export const parseReferenceSourceEntries = (
     );
   const packageInventory = readPackageMetadata(read, exclusions);
   const context: SpecifierContext = {
-    lookupPath: createReferenceSourcePathLookup(filePaths),
+    lookupPath: createReferenceSourcePathLookup(
+      read.entries
+        .filter((entry) => entry.status === "read" && entry.kind === "file")
+        .map((entry) => entry.path),
+    ),
     packages: packageInventory.packages,
     packageManifestPathLookup: packageInventory.pathLookup,
   };

tests/boundary/filesystem/referenceSourceImport.test.ts

@@ -497,7 +497,7 @@ describe("reference source symlink import", () => {
       limitations: [],
     };
 
-    const parsed = parseReferenceSourceEntries(read, new Set(), []);
+    const parsed = parseReferenceSourceEntries(read, []);
     expect(parsed.entries).toContainEqual(
       expect.objectContaining({
         kind: "symlink",