chore: 去掉 Bun，切换到 pnpm + 纯 Node runtime

- bun.lock → pnpm-lock.yaml + pnpm-workspace.yaml
- 删除 sqlite-adapter.ts（Bun/Node 双 runtime 兼容层，未被使用）
- package.json 删除 workspaces 字段，加 pnpm.onlyBuiltDependencies
- 加 vite 8 显式依赖（vitest 4.x peer dep）
- CLAUDE.md 全面更新：Runtime/Commands/Release 流程
- .gitignore 加 bun.lock

36/36 files pass, 617/617 tests pass

Fixes #66

packages/fs/src/sqlite-adapter.ts

@@ -1,99 +0,0 @@
-/**
- * SQLite adapter — uses bun:sqlite when running under Bun,
- * falls back to better-sqlite3 for Node.js.
- *
- * Exports a minimal interface matching the subset both libraries share.
- */
-
-// eslint-disable-next-line @typescript-eslint/no-explicit-any
-type Row = Record<string, any>;
-
-export type Statement = {
-  run(...params: unknown[]): void;
-  get(...params: unknown[]): Row | undefined;
-  all(...params: unknown[]): Row[];
-};
-
-export type SqliteDb = {
-  exec(sql: string): void;
-  prepare(sql: string): Statement;
-  transaction<T>(fn: () => T): () => T;
-  close(): void;
-};
-
-const IS_BUN = "Bun" in globalThis;
-
-export function openSqlite(path: string): SqliteDb {
-  if (IS_BUN) {
-    return openBunSqlite(path);
-  }
-  return openBetterSqlite(path);
-}
-
-function openBunSqlite(path: string): SqliteDb {
-  // Dynamic require to avoid bundler issues
-  // eslint-disable-next-line @typescript-eslint/no-require-imports, @typescript-eslint/no-var-requires
-  const { Database } = require("bun:sqlite");
-  const db = new Database(path);
-
-  return {
-    exec(sql: string) {
-      db.exec(sql);
-    },
-    prepare(sql: string): Statement {
-      const stmt = db.prepare(sql);
-      return {
-        run(...params: unknown[]) {
-          stmt.run(...params);
-        },
-        get(...params: unknown[]): Row | undefined {
-          return stmt.get(...params) ?? undefined;
-        },
-        all(...params: unknown[]): Row[] {
-          return stmt.all(...params);
-        },
-      };
-    },
-    transaction<T>(fn: () => T): () => T {
-      const wrapped = db.transaction(fn);
-      return wrapped;
-    },
-    close() {
-      db.close();
-    },
-  };
-}
-
-function openBetterSqlite(path: string): SqliteDb {
-  // Dynamic require to avoid bundler issues when running under Bun
-  // eslint-disable-next-line @typescript-eslint/no-require-imports, @typescript-eslint/no-var-requires
-  const BetterSqlite3 = require("better-sqlite3");
-  const db = new BetterSqlite3(path);
-
-  return {
-    exec(sql: string) {
-      db.exec(sql);
-    },
-    prepare(sql: string): Statement {
-      const stmt = db.prepare(sql);
-      return {
-        run(...params: unknown[]) {
-          stmt.run(...params);
-        },
-        get(...params: unknown[]): Row | undefined {
-          return stmt.get(...params) ?? undefined;
-        },
-        all(...params: unknown[]): Row[] {
-          return stmt.all(...params);
-        },
-      };
-    },
-    transaction<T>(fn: () => T): () => T {
-      const wrapped = db.transaction(fn);
-      return wrapped;
-    },
-    close() {
-      db.close();
-    },
-  };
-}