fix(reference): retain unknown kind for unsupported source entries

Keep FIFO, socket and device entries unknown instead of projecting unsupported reader entries as ordinary files. Preserve real file read-failure identity.

Fixes #3218

Co-authored-by: Saim Shafique <[email protected]>

src/application/ReferenceSourceImportEntries.test.ts

@@ -6,6 +6,64 @@ import { parseReferenceSourceEntries } from "./ReferenceSourceImportEntries.js";
 import { historicalSourceLanguages } from "../domain/referenceSourceGraph.js";
 import type { ReferenceSourceRead } from "../reference/ReferenceSourceReaderTypes.js";
 
+it("projects an unsupported non-regular entry as unknown kind instead of file", () => {
+  const read: ReferenceSourceRead = {
+    root: "/selected/source",
+    entries: [
+      {
+        status: "failed",
+        kind: "other",
+        path: "src/pipe",
+        code: "unsupported",
+        message: "Entry is not a regular file",
+        size: 0,
+      },
+    ],
+    bytesRead: 0,
+    limitations: [],
+  };
+  const parsed = parseReferenceSourceEntries(read, new Set());
+  expect(parsed.entries).toContainEqual({
+    path: "src/pipe",
+    kind: "unknown",
+    classifications: ["unknown"],
+    limitations: [
+      "Entry is not a regular file Exclude this entry or replace it with a regular file.",
+    ],
+  });
+  expect(parsed.entries.some((entry) => entry.kind === "file")).toBe(false);
+});
+
+it("keeps a failed regular file as file kind", () => {
+  const read: ReferenceSourceRead = {
+    root: "/selected/source",
+    entries: [
+      {
+        status: "failed",
+        kind: "file",
+        path: "src/broken.ts",
+        code: "io",
+        message: "Entry could not be read",
+      },
+    ],
+    bytesRead: 0,
+    limitations: [],
+  };
+  const parsed = parseReferenceSourceEntries(read, new Set());
+  expect(parsed.entries).toContainEqual({
+    path: "src/broken.ts",
+    kind: "file",
+    sha256: null,
+    size: null,
+    language: null,
+    classifications: ["source"],
+    content_state: "unreadable",
+    limitations: [
+      "Entry could not be read This file could not be read. Check its permissions, then try again.",
+    ],
+  });
+});
+
 it("retains Kotlin source identity and language across the inventory projection", () => {
   const files = [
     [

src/application/ReferenceSourceImportEntries.ts

@@ -75,7 +75,7 @@ const failedEntry = (
       classifications,
       limitations: [limitation],
     };
-  if (entry.kind === "unknown")
+  if (entry.kind === "unknown" || entry.kind === "other")
     return {
       path: entry.path,
       kind: "unknown",