整理项目记忆与Agent RAG入口

迁移项目共享记忆到 docs/project-memory，保留 .hermes 仅作为工具目录

新增 Agent 本地 RAG 索引与上下文包检索脚本

记录 RAG 依赖只安装到 .rag/runtime 并加入忽略规则

同步文档与检查脚本中的项目记忆路径

scripts/rag/index-docs.mjs

@@ -0,0 +1,68 @@
+import { mkdirSync, readFileSync } from 'node:fs';
+import { join } from 'node:path';
+
+import {
+  buildChunkId,
+  chunkText,
+  createEmbedder,
+  extractTitle,
+  hasFlag,
+  listSourceFiles,
+  loadRagRuntime,
+  parseLimitFiles,
+  readConfig,
+  repoRoot,
+} from './rag-utils.mjs';
+
+const config = readConfig();
+const limitFiles = parseLimitFiles(process.argv);
+const dryRun = hasFlag(process.argv, '--dry-run');
+
+const files = listSourceFiles(config, limitFiles);
+const rows = [];
+
+for (const file of files) {
+  const text = readFileSync(file.path, 'utf8');
+  const title = extractTitle(text, file.rel);
+  for (const chunk of chunkText(text, config.chunk ?? {})) {
+    rows.push({
+      id: buildChunkId(file.rel, chunk.index),
+      path: file.rel,
+      title,
+      chunk_index: chunk.index,
+      source_weight: file.weight,
+      text: chunk.text,
+    });
+  }
+}
+
+console.log(`[rag:index] source files=${files.length}, chunks=${rows.length}`);
+
+if (dryRun) {
+  for (const row of rows.slice(0, 10)) {
+    console.log(`- ${row.id} ${row.title}`);
+  }
+  process.exit(0);
+}
+
+if (rows.length === 0) {
+  throw new Error('No RAG chunks found.');
+}
+
+const { lancedb, transformers } = await loadRagRuntime(config);
+const embed = await createEmbedder(transformers, config.model);
+
+for (let index = 0; index < rows.length; index += 1) {
+  rows[index].vector = await embed(rows[index].text, 'passage');
+  if ((index + 1) % 25 === 0 || index + 1 === rows.length) {
+    console.log(`[rag:index] embedded ${index + 1}/${rows.length}`);
+  }
+}
+
+mkdirSync(join(repoRoot, config.databaseDir), { recursive: true });
+const db = await lancedb.connect(join(repoRoot, config.databaseDir));
+await db.createTable(config.tableName, rows, { mode: 'overwrite' });
+
+console.log(
+  `[rag:index] wrote table=${config.tableName}, db=${config.databaseDir}, model=${config.model}`,
+);