chore: commit pre-existing untracked work + finish archived-doc notes

Commits work that predated this session and was sitting untracked:
qualitative sell strategy module (src/quant_engine), the t20 outcome
ledger cron workflow, the QuantEngine masterpiece roadmap doc, a WBS
execution yaml, and shared Razor Pages partials (page header, delete
confirm modal) with their view models. Verified these build clean
(0 errors, 0 warnings) before committing.

Also includes the "ARCHIVED" header notes on 6 docs archived in the
previous commit - the git-mv landed there, but the note text itself
was missed from that commit's staged file list.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/dotnet/QuantEngine.Web/Pages/Shared/_PageHeader.cshtml

@@ -0,0 +1,21 @@
+@model QuantEngine.Web.Pages.Shared.PageHeaderViewModel
+
+<div class="page-header d-print-none mb-3">
+    <div class="row align-items-center">
+        <div class="col">
+            @if (!string.IsNullOrEmpty(Model.PreTitle))
+            {
+                <div class="page-pretitle text-muted text-uppercase fs-7 fw-bold mb-1">@Model.PreTitle</div>
+            }
+            <h2 class="page-title fw-bold">@Model.Title</h2>
+        </div>
+        @if (Model.HasAction)
+        {
+            <div class="col-auto ms-auto d-print-none">
+                <a href="@Model.ActionUrl" class="btn btn-primary">
+                    @Model.ActionText
+                </a>
+            </div>
+        }
+    </div>
+</div>