[Docs] (Disaggregated): the top-level files become short indexes in plain language; the design text moves to design/, the how-to and reference material to guide/

- README, ARCHITECTURE, ROADMAP, MEASUREMENTS and CURRENT_STAGE_PROGRESS are rewritten as indexes
  (84 KB -> 15 KB): what the project is, where it stands, and where each detail lives. ROADMAP is one
  plain sentence per phase; MEASUREMENTS is the five conclusions that matter plus one line per phase;
  CURRENT_STAGE_PROGRESS is the P12 goal, a checklist and the next steps.
- ARCHITECTURE's body moves unchanged into ten design/ files, keeping §1-§17 and appendices A/B, so
  `ARCHITECTURE.md §N` references in code resolve through the table in ARCHITECTURE.md.
- guide/ holds build-and-run, code map, glossary and the engineering discipline (from README and
  ROADMAP), and the device pinning record that used to sit in devices/.
- The open-debt table moves to notes/DEBTS.md; the detailed current-stage tables (with decision IDs,
  the open line items and evidence locations) move into notes/p12/README.md. notes/README.md maps
  every moved path and section.
- The documentation citation lint in test.yml also covers design/ and guide/, which describe the
  current tree as the top-level files did.

docs/Disaggregated/guide/code-map.md

@@ -0,0 +1,14 @@
+# 代码地图
+
+> 参考。文档导航见 [`../README.md`](../README.md)；目录布局与构建选项见 [`../design/09-build-switches-counters.md`](../design/09-build-switches-counters.md) §16。
+
+| 路径 | 作用 |
+|---|---|
+| `MobileGL/MG_Pipe/` | 接口本身：调用目录 `PipeCalls.def` 与其他 `.def` 表、payload / 句柄 / 回调头、`PipeApply`、`PipeRoute`、`generated/*.inc`（生成物，提交进树） |
+| `MobileGL/MG_Impl/Pipe/` | 前端：Tracker、`PipeFill`、`SlotAllocator`、`CsoCache`、`CompositeResolver`、`ResourceTracker`、各族 `*Emit.h` |
+| `MobileGL/MG_Backend/MGPipe/` | `PipeInputs`：后端读的、被前端推来的状态块 |
+| `MobileGL/MG_Remote/` | 拆分专用（仅 `MOBILEGL_BUILD_DISAGGREGATED`）：`Protocol/`（控制面 schema）、`Transport/`（控制面 `ITransport` × 数据面 `ILink`）、`Wire/`（记录编解码）、`Client/`、`Server/`；各阶段的 wire 契约 `CONTRACT-*.md` |
+| `MobileGL/MG_Util/Metrics/PipeStats.{h,cpp}` | 边界计数器（`MOBILEGL_PIPE_STATS=1`） |
+| `MobileGL/MG_Test/Pipe/`、`MG_Test/Wire/`、`MG_IntegrationTest/Harness/*Peek` | 目录 / tracker / 发射器单元测试、wire 与 remote 单元测试、白盒断言 |
+| `scripts/` | 生成器（`gen_pipe.py`、`gen_pipe_field_ownership.py`、`gen_pipe_dirty_surface.py`、`gen_protocol.py`）、门脚本（`symbol_report.py`、`check_include_closure.py`、`link_ratchet.py`、G5 保护区脚本、`check_doc_citations.py`）、`ci/` |
+| `tools/trace_replay/`、`tools/device_bench/` | trace 回放（含 TCP 矩阵跑器）、设备定频与配对 A/B 工具 |