refactor: dedupe probe error formatting

src/memory-host-sdk/host/batch-error-utils.ts

@@ -1,3 +1,5 @@
+import { formatErrorMessage } from "../../infra/errors.js";
+
 type BatchOutputErrorLike = {
   error?: { message?: string };
   response?: {
@@ -26,6 +28,6 @@ export function extractBatchErrorMessage(lines: BatchOutputErrorLike[]): string
 }
 
 export function formatUnavailableBatchError(err: unknown): string | undefined {
-  const message = err instanceof Error ? err.message : String(err);
+  const message = formatErrorMessage(err);
   return message ? `error file unavailable: ${message}` : undefined;
 }

src/memory-host-sdk/host/memory-schema.ts

@@ -1,4 +1,5 @@
 import type { DatabaseSync } from "node:sqlite";
+import { formatErrorMessage } from "../../infra/errors.js";
 
 export function ensureMemoryIndexSchema(params: {
   db: DatabaseSync;
@@ -74,7 +75,7 @@ export function ensureMemoryIndexSchema(params: {
       );
       ftsAvailable = true;
     } catch (err) {
-      const message = err instanceof Error ? err.message : String(err);
+      const message = formatErrorMessage(err);
       ftsAvailable = false;
       ftsError = message;
     }

src/memory-host-sdk/host/qmd-query-parser.ts

@@ -1,3 +1,4 @@
+import { formatErrorMessage } from "../../infra/errors.js";
 import { createSubsystemLogger } from "../../logging/subsystem.js";
 
 const log = createSubsystemLogger("memory");
@@ -42,7 +43,7 @@ export function parseQmdQueryJson(stdout: string, stderr: string): QmdQueryResul
     }
     throw new Error("qmd query JSON response was not an array");
   } catch (err) {
-    const message = err instanceof Error ? err.message : String(err);
+    const message = formatErrorMessage(err);
     log.warn(`qmd query returned invalid JSON: ${message}`);
     throw new Error(`qmd query returned invalid JSON: ${message}`, { cause: err });
   }

src/memory-host-sdk/host/sqlite-vec.ts

@@ -1,4 +1,5 @@
 import type { DatabaseSync } from "node:sqlite";
+import { formatErrorMessage } from "../../infra/errors.js";
 
 export async function loadSqliteVecExtension(params: {
   db: DatabaseSync;
@@ -18,7 +19,7 @@ export async function loadSqliteVecExtension(params: {
 
     return { ok: true, extensionPath };
   } catch (err) {
-    const message = err instanceof Error ? err.message : String(err);
+    const message = formatErrorMessage(err);
     return { ok: false, error: message };
   }
 }

src/memory-host-sdk/host/sqlite.ts

@@ -1,4 +1,5 @@
 import { createRequire } from "node:module";
+import { formatErrorMessage } from "../../infra/errors.js";
 import { installProcessWarningFilter } from "../../infra/warning-filter.js";
 
 const require = createRequire(import.meta.url);
@@ -8,7 +9,7 @@ export function requireNodeSqlite(): typeof import("node:sqlite") {
   try {
     return require("node:sqlite") as typeof import("node:sqlite");
   } catch (err) {
-    const message = err instanceof Error ? err.message : String(err);
+    const message = formatErrorMessage(err);
     // Node distributions can ship without the experimental builtin SQLite module.
     // Surface an actionable error instead of the generic "unknown builtin module".
     throw new Error(