chore: establish YCode replication baseline and TODO

scripts/rea/capture-ycode-font-platform-fixture.mjs

@@ -0,0 +1,37 @@
+import { createRequire } from 'node:module'
+import { mkdir, writeFile } from 'node:fs/promises'
+import { fileURLToPath } from 'node:url'
+import path from 'node:path'
+import { captureYcodePlatformFonts } from './verify-font-platform-parity.mjs'
+
+const require = createRequire(import.meta.url)
+const projectRoot = path.resolve(path.dirname(fileURLToPath(import.meta.url)), '../..')
+const outputPath = path.resolve(projectRoot, process.argv[2] ?? '.tmp/ycode-font-platform-selftest-reference.json')
+const samples = [
+  { category: 'assistant-name', text: 'YCode' },
+  { category: 'chinese-body', text: '中文字体字形探针：你好，世界！这是用于复现的正文样本。' },
+  { category: 'english-body', text: 'Typography fixture: The quick brown fox jumps over 13 lazy dogs.' },
+  { category: 'user-bubble', text: '请对照这条用户消息的 glyph count，其中包含 English。' },
+  { category: 'code', text: 'const greeting = "你好, YCode";\nconsole.log(greeting);' }
+]
+
+const captured = await captureYcodePlatformFonts(samples)
+const report = {
+  schemaVersion: 1,
+  source: { kind: 'ycode-electron-self-test', description: 'Local YCode Electron fixture; this is not WorkBuddy evidence.' },
+  evidenceId: `local-ycode-font-fixture-${Date.now()}`,
+  version: `YCode ${require('../../package.json').version}`,
+  capturedAt: new Date().toISOString(),
+  environment: captured.environment,
+  samples: captured.samples,
+  missing: []
+}
+await mkdir(path.dirname(outputPath), { recursive: true })
+await writeFile(outputPath, `${JSON.stringify(report, null, 2)}\n`)
+console.log(JSON.stringify({
+  kind: report.source.kind,
+  evidenceId: report.evidenceId,
+  version: report.version,
+  samples: report.samples.map((sample) => ({ category: sample.category, fontFamily: sample.fontFamily, platformFonts: sample.platformFonts })),
+  outputPath: path.relative(projectRoot, outputPath).replaceAll('\\', '/')
+}, null, 2))