feat: plan agent v2, global chat mode, and user-mode v2 flag sync

- Add runtime/plan_agent_v2 package and shims; gateway/direct_loop/WS wiring

- Admin chat: interaction mode and specialist only in user menu; session API stores memory_mode and execution_mode only

- POST /admin/api/chat/user-mode mirrors plan_agent_version to AIA_EXPERT_PLAN_AGENT_V2_ENABLED (v2 to 1, v1 to 0)

- Composer cleanup (hidden mode select, no reasoning toggle in meta bar); tests and _local/system.env.example

Co-authored-by: Cursor <cursoragent@cursor.com>

.gitignore

@@ -33,10 +33,8 @@ data/mcp_local.env
 data/google_oauth_client.json
 data/_pre_merge_sqlite_*/
 # oclaw 子仓库运行态目录（勿提交）
-_local/
-_local/*.env
-_local/*.json
-_local/*.txt
+_local/*
+!_local/system.env.example
 data/channel_sidecar/
 data/wiki/
 data/**/node_modules/
@@ -48,11 +46,7 @@ runtime/operations/scripts/.run/
 desktop/node_modules/
 desktop/dist/
 desktop/runtime-data/
-# 本地密钥（随仓库目录迁移时记得复制此文件；勿提交）
-_local/google_oauth_client.json
-_local/mcp_local.env
-# MCP admin export / 安装后自动备份（可重装 JSON，本机 path 与列表可能不同）
-_local/mcp_registry_migrated.json
+# _local/ 下其余文件均忽略（密钥、mcp_local.env 等）
 platform/data/*.sqlite
 platform/data/*.sqlite-journal
 platform/data/*.sqlite-shm