docs(archreview): add cross-plan parallelization map for incomplete tasks + sync stale PLAN-04 status

Corrects the Status Board (PLAN-04 24/26, not 0), and adds a Parallelization Map to
00-MASTER-TRACKER plus a per-plan Parallelization block to PLAN-04/05/06/07/08. Derives
ready sets from the live .tasks.json blockedBy graphs and the Files metadata, identifies
the initiative-wide serialization mutexes (ManagementActor.cs single-writer, EF migration
snapshot, Host/Program.cs, ArtifactDeploymentService.cs, SiteStorageService.cs,
NotificationOutboxActor.cs, AlarmSummary.razor), and recommends the safe concurrent
subagent lanes per plan. Flags PLAN-07 T33 as a dedupe-skip (CLI.Tests already in slnx).

archreview/plans/PLAN-04-data-audit-backbone.md

@@ -8,6 +8,10 @@
 
 **Tech Stack:** C#/.NET 8, Akka.NET (actors/TestKit), EF Core + SQL Server (central), Microsoft.Data.Sqlite (site), xUnit. Build: `dotnet build ZB.MOM.WW.ScadaBridge.slnx`. Test per-project: `dotnet test tests/<project> --filter <name>`. MSSQL-backed integration tests need `cd infra && docker compose up -d`. **EF migrations gotcha (repo-documented):** always build first and run `dotnet ef migrations add <Name>` WITHOUT `--no-build`, or it scaffolds an empty migration off the stale DLL.
 
+## Parallelization (incomplete tasks) — 2026-07-09
+
+**Open:** **T24** (design-doc reconciliation, docs-only) → **T26** (full `dotnet build`/`dotnet test` sweep). Strictly **sequential** — T26 `blockedBy` T24 plus every code task (all done except T24). No intra-plan parallelism and **no cross-plan shared-file conflict** (docs + build/test only), so a PLAN-04 executor can run concurrently with any other plan's session. Whole-initiative view: [00-MASTER-TRACKER.md § Parallelization Map](00-MASTER-TRACKER.md#parallelization-map--incomplete-tasks-2026-07-09).
+
 ## Findings Coverage
 
 | # | Report finding (severity) | Task(s) |