chore: cleanup and lint fix

packages/plugin-sdk/package.json

@@ -41,6 +41,7 @@
   },
   "dependencies": {
     "@moeru/eventa": "catalog:",
+    "@moeru/std": "catalog:",
     "@proj-airi/plugin-protocol": "workspace:*",
     "@proj-airi/server-shared": "workspace:*",
     "nanoid": "catalog:",

packages/plugin-sdk/src/plugin-host/core.ts

@@ -32,6 +32,7 @@ import type { PluginTransport } from './transports'
 import { cwd } from 'node:process'
 
 import { defineInvokeHandler } from '@moeru/eventa'
+import { errorMessageFrom } from '@moeru/std'
 import {
   errorPermission,
   moduleAnnounce,
@@ -1320,7 +1321,7 @@ export class PluginHost {
       session.channels.host.emit(moduleStatus, {
         identity: session.identity,
         phase: 'failed',
-        reason: error instanceof Error ? error.message : 'Failed to load plugin.',
+        reason: errorMessageFrom(error) ?? 'Failed to load plugin.',
       })
 
       throw error
@@ -1568,7 +1569,7 @@ export class PluginHost {
       session.channels.host.emit(moduleStatus, {
         identity: session.identity,
         phase: 'failed',
-        reason: error instanceof Error ? error.message : 'Plugin host initialization failed.',
+        reason: errorMessageFrom(error) ?? 'Plugin host initialization failed.',
       })
 
       this.cleanupSession(session)

packages/plugin-sdk/src/utils/error-message.ts

@@ -0,0 +1,17 @@
+import { errorMessageFrom } from '@moeru/std'
+
+/**
+ * Returns an error message while preserving JavaScript string fallback.
+ *
+ * Use when:
+ * - Plugin host diagnostics need a message for arbitrary thrown values.
+ *
+ * Expects:
+ * - `error` may be any thrown value.
+ *
+ * Returns:
+ * - The extracted error message, else `String(error)`.
+ */
+export function errorMessageFromValue(error: unknown): string {
+  return errorMessageFrom(error) ?? String(error)
+}