fix(eval): run the harness on Windows and keep the baseline POSIX

scripts/eval-chunking.mjs

@@ -63,10 +63,10 @@ function readArg(prefix, fallback) {
   return arg ? arg.slice(prefix.length) : fallback
 }
 
-const executable = resolve(
-  'node_modules/.bin',
-  process.platform === 'win32' ? 'electron.cmd' : 'electron'
-)
+// Node 24 refuses to spawn a `.cmd`/`.bat` without `shell: true` (EINVAL), and the
+// `.bin` entry is exactly that on Windows. Use the real binary the wrapper runs.
+const { default: electronBinary } = await import('electron')
+const executable = resolve(electronBinary)
 
 if (!existsSync(executable)) {
   console.error('[chunking] could not find the electron binary. Run `npm install` first.')

scripts/eval-retrieval.mjs

@@ -39,10 +39,10 @@ function readArg(prefix, fallback) {
   return arg ? arg.slice(prefix.length) : fallback
 }
 
-const executable = resolve(
-  'node_modules/.bin',
-  process.platform === 'win32' ? 'electron.cmd' : 'electron'
-)
+// Node 24 refuses to spawn a `.cmd`/`.bat` without `shell: true` (EINVAL), and the
+// `.bin` entry is exactly that on Windows. Use the real binary the wrapper runs.
+const { default: electronBinary } = await import('electron')
+const executable = resolve(electronBinary)
 
 if (!existsSync(executable)) {
   console.error('[retrieval] could not find the electron binary. Run `npm install` first.')

scripts/eval.mjs

@@ -18,10 +18,12 @@ import { resolve } from 'node:path'
 const prepare = process.argv.includes('--prepare')
 const flag = prepare ? '--eval-prepare' : '--eval-harness'
 
-const executable = resolve(
-  'node_modules/.bin',
-  process.platform === 'win32' ? 'electron.cmd' : 'electron'
-)
+// The `.bin` entry is a shell wrapper (`electron.cmd` on Windows), and Node 24
+// refuses to spawn `.cmd`/`.bat` without `shell: true` — it fails with EINVAL. The
+// `electron` package exports the path to the real executable the wrapper runs, so
+// spawning that directly works on every platform without a shell.
+const { default: electronBinary } = await import('electron')
+const executable = resolve(electronBinary)
 
 if (!existsSync(executable)) {
   console.error('[eval] could not find the electron binary. Run `npm install` first.')

src/main/eval/run.ts

@@ -13,7 +13,7 @@
 import { app } from 'electron'
 import { mkdtempSync, rmSync, writeFileSync } from 'fs'
 import { mkdir } from 'fs/promises'
-import { join, relative, resolve } from 'path'
+import { join, relative, resolve, sep } from 'path'
 import { tmpdir } from 'os'
 import { closeDatabase, getDatabase, initDatabase, initVectorStore, runMigrations } from '../db'
 import { ConnectionManager } from '../models/ConnectionManager'
@@ -62,6 +62,18 @@ function readBoolOption(argv: readonly string[], prefix: string, fallback: boole
   return value === 'true'
 }
 
+/**
+ * Repo-relative path with POSIX separators.
+ *
+ * `path.relative` returns backslashes on Windows, and the corpus label is committed
+ * in the baseline. Without this, a Windows run writes `eval\corpus` and the file
+ * stops being identical on every machine — which is the one property the committed
+ * report promises.
+ */
+function repoRelative(absolutePath: string): string {
+  return relative(process.cwd(), absolutePath).split(sep).join('/')
+}
+
 /** 检索策略（#77）。默认 dense，所以不带 flag 的 `npm run eval` 仍量的是生产默认。 */
 function readRetrievalStrategy(argv: readonly string[]): RetrievalStrategy {
   const raw = readOption(argv, '--eval-retrieval=', 'dense')
@@ -162,9 +174,9 @@ export async function runEvalCli(argv: readonly string[] = process.argv): Promis
     const knowledgeService = new KnowledgeService(embeddingService)
     const options: EvalHarnessOptions = {
       corpusDir,
-      // Recorded in the report as a repo-relative path so the committed JSON is
-      // identical on every machine and checkout.
-      corpusLabel: relative(process.cwd(), corpusDir) || 'eval/corpus',
+      // Recorded in the report as a repo-relative, POSIX-separated path so the
+      // committed JSON is identical on every machine and checkout.
+      corpusLabel: repoRelative(corpusDir) || 'eval/corpus',
       questionsPath,
       baseline: readOption(argv, '--eval-baseline=', 'v1.5'),
       topK: 10,