chore: establish YCode replication baseline and TODO

scripts/rea/recover-settings-shell.mjs

@@ -0,0 +1,27 @@
+// Recover only already-retained REA CSS; never access the installed application here.
+import fs from 'node:fs/promises'
+import { createHash } from 'node:crypto'
+import postcss from 'postcss'
+const sha = value => createHash('sha256').update(value).digest('hex')
+const evidenceId = 'ev_40da6df0424193923bae64a8ccb6fca97ea67813d7de671986d4d7e154b848c1'
+const evidence = JSON.parse(await fs.readFile(`.tmp/rea-css-evidence/${evidenceId}.json`, 'utf8'))
+if (evidence.evidence_id !== evidenceId) throw new Error('REA identity mismatch')
+const module = evidence.normalized_result.styles.items.find(item => /settings-window-perf-ILa933LI.css$/.test(item.file_path))
+const windowCss = module.source.artifact.text
+if (sha(windowCss) !== '8036657ec27f8948c6bad60c835d62469e958db4a5b9c25e22e5a9e60c0ea986') throw new Error('Window CSS changed')
+const contexts = await fs.readFile('.tmp/rea-css-recovered/contexts-BkjwYSZT.css', 'utf8')
+if (sha(contexts) !== '50cbd673f7f35fc7f966bdddc6c9f5677fdfe944cb904888d214619fca259380') throw new Error('Contexts CSS changed')
+function project(node) {
+  if (node.type === 'rule') {
+    const selectors = node.selectors.filter(selector => /\.settings-(modal|navigation)/.test(selector))
+    return selectors.length ? node.clone({ selector: selectors.join(',') }) : null
+  }
+  if (node.type === 'atrule' && node.nodes) {
+    const nodes = node.nodes.map(project).filter(Boolean)
+    return nodes.length ? node.clone({ nodes }) : null
+  }
+  return null
+}
+const root = postcss.root({ nodes: postcss.parse(contexts).nodes.map(project).filter(Boolean) })
+await fs.writeFile('src/renderer/src/components/settings-shell-source.css', `/* REA ${evidenceId}; settings-window CSS sha256=${sha(windowCss)}; contexts sha256=${sha(contexts)}. */\n${root.toString()}\n${windowCss}\n`)
+console.log('Recovered settings shell CSS with original media conditions')