docs: harden login reachability schema

docs/go-mcp-minimal-plan.md

@@ -10,6 +10,28 @@
 
 ---
 
+## 2026-07-12 Current Next Node Correction
+
+当前下一节点不再是泛化的 `N12-pre` 离线证据整理，也不是 A-route/RPA UI 演示。A-route/RPA 只保留为备选；主线继续走 B-route，也就是面向登录态客户端的 `in_process_adapter_research` / `in_process_contract`。
+
+**当前主线节点：B-route 登录可达性 schema/probe package。**
+
+本节点的目标是在 2026-07-13 可登录环境执行前，把验证口径一次性补齐，避免明天反复采证。活动产物：
+
+- `docs/source-discovery/2026-07-12-login-reachability-validation-items.md`
+- `docs/source-discovery/2026-07-12-send-upload-deep-dive.md`
+- `docs/source-discovery/2026-07-12-inprocess-adapter-static-map.md`
+- `docs/source-discovery/capability-source-matrix.md`
+
+本节点通过条件：
+
+1. 登录验证清单包含 P0 项：one-shot 测试目标、登录态 server/auth、in-process adapter 可达性、发送前后 sent-record 快照、sent-record 来源、结构化失败原因、消息/文件 ack 关联。
+2. `isphere_send_message` 只在 direct/group 目标、`AppContextManager` / `Chat` / `XMPPConnection` 可达、sent-record 内容哈希/ack 关联通过后解除生产阻塞。
+3. `isphere_send_file` 只在 `FileUploadPara`、`IFileTransfer.FileUpload`、`FileUploadResult.FileID`、`trans_UploadCompleted(fileId)` / `Chat.sendFileMessage`、文件 sent-record/ack 关联通过后解除生产阻塞。
+4. 外部 sidecar 仍是 preview/probe-only；A-route UIA/RPA 仍是 backup-only。
+
+---
+
 ## 1. Node Tree
 
 ```text
@@ -962,16 +984,16 @@ Every node must satisfy these rules:
 
 ## 4. Current Next Node
 
-Current guidance after N0-N15 remote updates is:
+Current guidance after the 2026-07-12 offline B-route audit and login-validation schema hardening is:
 
 ```text
-当前下一步：MCP 核心工具合同冻结 + 只读消息源 discovery + N12-pre 证据包整理。
+当前下一步：B-route 登录可达性 schema/probe package；明天在可登录环境采集一次性证据。
 ```
 
 Immediate next action:
 
 ```text
-Use `docs/mcp-core-tools-contract.md` and `docs/mcp-core-business-plan.md` as the active business route. Prioritize `isphere_search_contacts`, `isphere_search_groups`, `isphere_receive_messages`, and `isphere_receive_files`, then move `isphere_send_message` and `isphere_send_file` into Stage D after source discovery and connector verification.
+Use `docs/source-discovery/2026-07-12-login-reachability-validation-items.md` as the active schema. Build the 2026-07-13 login reachability probe package around one-shot targets, runtime/server/auth state, in-process adapter reachability, before/after sent-record snapshots, structured failure reasons, and message/file ack correlation.
 ```
 
-N12-pre offline evidence remains pre-gate context. Existing UIA selector/report work is auxiliary evidence and fallback support only; the project core is MCP communication capability for contacts, groups, messages, and files.
+Business status: contact search, group search, receive messages, and receive file-list remain the stable MCP foundation. `isphere_send_message` and `isphere_send_file` are implemented as preview/contract paths, but production send/file remains blocked until logged-in B-route reachability and sent-record/ack correlation pass. N12-pre/offline evidence remains pre-gate context. Existing UIA selector/report/RPA work is auxiliary evidence and fallback support only; the project core is MCP communication capability for contacts, groups, messages, and files.