docs(split): mark Phase 1 landed in PLAN.md and TWO-APP-SPLIT.md

PLAN.md

@@ -14,6 +14,8 @@ The public site and the CMS are being split into two independent Blazor applicat
 
 Supersedes the host-shape pieces of `CMS-PLAN.md §2`; the CMS feature waves in `CMS-PLAN.md` survive unchanged and move to the new host.
 
+Phase 1 (`DeepDrftManager` host creation) landed. Phase 2 (strip AuthBlocks from DeepDrftWeb) and Phase 3 (DeepDrftShared.Client RCL extraction) are Wave 2 — can run in parallel.
+
 ---
 
 ## 0. Baseline — what just landed

design/TWO-APP-SPLIT.md

@@ -337,6 +337,8 @@ The current `MainLayout.razor` (`<div>@Body</div>` one-liner) is unshippable, bu
 
 **Exit criterion:** CMS host stands up, `/account/login` works against the seeded admin, `/cms/tracks` renders. Public site continues to run from `DeepDrftWeb` exactly as today (still entangled, still using band-aid MainLayout).
 
+**Landed:** branch `split-phase1-manager`, commit `cd650c4`.
+
 **Phase 2: Strip AuthBlocks out of `DeepDrftWeb`.**
 
 - Remove the `AddAuthBlocks(...)`, `MapAuthBlocks()`, `UseAuthBlocksStartupAsync()` from `DeepDrftWeb/Program.cs`.