docs(ai-team): Master page migration batch logging

Session: 2026-04-27-master-page-migration
Requested by: Jeffrey T. Fritz

Changes:
- Logged 2026-04-27 master-page-migration session
- Appended learnings to Forge, Cyclops, Bishop, Beast, Jubilee, Rogue, Colossus history files
- No product code modified

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: csharpfritz

.squad/agents/beast/history.md

@@ -25,6 +25,22 @@
 
 **M17 AJAX docs (6 pages):** Timer, ScriptManager, ScriptManagerProxy, UpdatePanel, UpdateProgress, Substitution. New "AJAX Controls" nav section in mkdocs.yml. Migration stub doc pattern established (warning admonition + ignored props + include→remove lifecycle). Substitution moved from deferred to implemented.
 
+### 2026-04-27: MasterPages.md Documentation Update
+
+**Task:** Document MasterPageContext architecture and Master/Content/ContentPlaceHolder migration patterns in docs/Migration/MasterPages.md.
+
+**Changes delivered:**
+- Created comprehensive MasterPages.md in docs/Migration/ folder
+- Added MasterPageContext architecture section explaining cascading pattern
+- Included before/after migration examples showing Web Forms vs Blazor syntax
+- Documented Content/ContentPlaceHolder nesting patterns and best practices
+- Added troubleshooting section for context lookup failures
+- Cross-referenced ComponentList.razor for discoverability
+- Structured with: Feature Overview → Architecture → Code Examples → Nesting Patterns → Common Issues → Migration Checklist
+- Aligned with existing migration guide style (SkinsAndThemes.md pattern)
+
+**Pattern consistency:** Matches Beast's established separation: SkinsAndThemes.md (strategy) vs SkinsAndThemesGuide.md (practical). MasterPages.md is the practical implementation guide.
+
 **Issue #359 doc updates (5 pages):** ChangePassword and PagerSettings verified complete. FormView got CRUD events + NOT Supported section. DetailsView got full style sub-component elements. DataGrid paging section enhanced. Pattern: DataGrid is the only pageable control without PagerSettings.
 
 **M10 Skins & Themes Guide:** Created `docs/Migration/SkinsAndThemes.md` — practical guide coexisting with `ThemesAndSkins.md` (strategy). Convention: separate "Guide" vs "Strategy" docs with clear nav labels.

.squad/agents/bishop/history.md

@@ -29,6 +29,25 @@
 
 **Key Layer 2 patterns:** `@inherits WebFormsPageBase` conflicts with `: ComponentBase` — must remove explicit base. Layout files need `: LayoutComponentBase`. `AddHttpContextAccessor()` before `AddBlazorWebFormsComponents()`. Stub model pattern for unavailable types (UserLoginInfo, OrderShipInfo). Stub page cleanup ~60% of L2 effort.
 
+### 2026-04-27: CLI & PowerShell Migration Path Updates for MasterPage
+
+**Task:** Update bwfc-migrate.ps1 and associated CLI components to preserve MasterPage/Content/ContentPlaceHolder component trees during Layer 1 transformation.
+
+**Changes delivered:**
+- Enhanced bwfc-migrate.ps1 with MasterPage/Content/ContentPlaceHolder aware transforms
+- Added Test-MasterPagePreservation validation to verify MasterPage structure integrity post-transform
+- CLI now recognizes MasterPage nesting patterns and preserves them intact
+- PowerShell migration path includes ContentPlaceHolder ID preservation
+- Content components correctly reference owning ContentPlaceHolder IDs
+- Cascading context properly wired in transformed output
+
+**Validation commands added:**
+- Test-MasterPagePreservation — validates MasterPage structure post-transform
+- Confirms Content components reference correct ContentPlaceHolder IDs
+- Validates cascading context is properly wired
+
+**Integration:** Tested against Layer 1 output. MasterPage nesting patterns survive full transformation pipeline intact. Test coverage added by Rogue.
+
 ## Learnings
 
 ### Cycle 3 Fixes Applied (Bishop) — Script + Auth Services

.squad/agents/colossus/history.md

@@ -28,6 +28,36 @@ Added 5 smoke test InlineData entries (M9 audit gaps: ListView/CrudOperations, L
 
 ## Summary: PR #377 DetailsView Integration Test Fix (2026-02-26)
 
+- DetailsView smoke + interaction tests initially waited for DOMContentLoaded
+- FormView/DetailsView bind data in OnAfterRenderAsync — DOMContentLoaded fires before data binding completes
+- Switched targeted DetailsView interaction tests to WaitUntilState.NetworkIdle
+- Ensures cascading parameters resolve and FormView/DetailsView data renders
+- Pattern now reused for similar async-bound components
+
+### 2026-04-27: MasterPageContext Integration Testing & Timing Fix
+
+**Task:** Add Playwright integration tests for MasterPage component bridge and fix timing issues.
+
+**Test coverage added:**
+- `tests/Integration/MasterPageTests.cs` — MasterPage smoke and interaction tests
+- Validates MasterPage renders without error
+- Content/ContentPlaceHolder placeholder content displays correctly
+- Nested hierarchy renders all levels with proper cascading
+- MasterPageContext discovery validates parent-child chain
+
+**Playwright timing fix applied:**
+- Changed generic smoke test to `WaitUntilState.NetworkIdle` (from default DOMContentLoaded)
+- Ensures asynchronous cascading parameter resolution completes before assertions
+- Eliminates race condition where ContentPlaceHolder context wasn't available yet
+- Same pattern used successfully for DetailsView (PR #377)
+- Impact: Test now waits for all network activity (CSS/JS) to complete before assertions
+
+**Test results:**
+- ✅ All MasterPage integration tests passing
+- ✅ No console errors specific to component tree
+- ✅ ContentPlaceHolder content visible and interactive
+- ✅ Timing fix eliminates flaky test failures
+
 Fixed 5 stale Customer→Product assertions in InteractiveComponentTests.cs after DetailsView sample pages migrated to Product model. All 7 DetailsView integration tests passing.
 
 ## Summary: M17 AJAX Control Integration Tests (2026-02-27)

.squad/agents/cyclops/history.md

@@ -141,7 +141,26 @@ New EventArgs: `RepeaterCommandEventArgs`, `RepeaterItemEventArgs`, `DataListCom
 - EF Core wildcard version `10.0.0-*` avoids NU1603 warnings for preview packages
 
  Team update (2026-03-06): bwfc-migrate.ps1 uses -Path and -Output params (not -SourcePath/-DestinationPath). ProjectName is auto-detected  decided by Bishop
+ 
 
+### 2026-04-27: MasterPageContext Implementation & Component Bridge
+
+**Task:** Implement MasterPageContext cascading pattern for MasterPage/Content/ContentPlaceHolder component bridge.
+
+**Changes delivered:**
+- **MasterPage.razor/MasterPage.razor.cs:** Created MasterPageContext class with MasterPage reference + RegisterContentPlaceHolder/GetContentPlaceHolder methods. Wraps component tree in `<CascadingValue Value="this.Context">`. Provides parent discovery mechanism.
+- **Content.razor/Content.razor.cs:** Injects MasterPageContext via [CascadingParameter], validates parent is MasterPage, registers self with parent context.
+- **ContentPlaceHolder.razor/ContentPlaceHolder.razor.cs:** Injects MasterPageContext via [CascadingParameter], locates owning Content via context lookup, renders placeholder at correct hierarchy level.
+
+**Key properties:**
+- All three components discoverable via CascadingValue chain (no direct parent references)
+- Supports dynamic registration/unregistration
+- Thread-safe context operations
+- Enables multi-level Content/ContentPlaceHolder nesting
+
+**Testing:** Unit tests cover context discovery, registration, parent resolution, nested hierarchies. All passing. Build: 0 errors, 0 warnings.
+
+**Pattern:** Mirrors Blazor's AuthenticationState + AuthorizeView design (2026-03-05) for consistency. CascadingValue precedent established in M10 theming work.
 
  Team update (2026-03-06): Forge produced 5 library improvement recommendations (L1-L5) assigned to Cyclops  L1: Response.Redirect shim on WebFormsPageBase (HIGH), L2: Request.QueryString shim (MEDIUM), L3: DataBind() no-op (LOW-MED), L4: form-submit.js helper (MEDIUM), L5: WebFormsSessionService (MEDIUM). Recommended Cycle 2: L1  decided by Forge
  Team update (2026-03-06): WebFormsPageBase is the canonical base class for all migrated pages (not ComponentBase). All agents must use WebFormsPageBase  decided by Jeffrey T. Fritz

.squad/agents/forge/history.md

@@ -271,3 +271,34 @@ Team updates (2026-03-04-05): PRs upstream, reports in docs/migration-tests/, be
 **Estimated coverage improvement:** 70% → 88% L1 mechanical coverage after P0+P1+P2
 
 **Decision:** `.squad/decisions/inbox/forge-cli-gap-analysis.md`
+
+### 2026-04-27: MasterPageContext Pattern Approval
+
+**Task:** Review MasterPageContext implementation batch (Cyclops, Bishop, Beast, Jubilee, Rogue, Colossus) for MasterPage/Content/ContentPlaceHolder component bridge.
+
+**Architecture approved:**
+- CascadingValue<MasterPageContext> pattern enables discoverable parent-child hierarchy
+- MasterPageContext wraps component tree, propagates MasterPage instance
+- Content/ContentPlaceHolder locate parent via cascading parameter injection (no direct references)
+- Supports multi-level nesting without tight coupling
+- Mirrors Blazor AuthenticationState pattern for consistency
+
+**Implementation verified:** 
+- All three components (MasterPage, Content, ContentPlaceHolder) cooperate through MasterPageContext service
+- Thread-safe context operations
+- Dynamic registration/unregistration supported
+- Unit tests cover context discovery, registration, parent resolution, nested hierarchies
+- Transform coverage: Layer 1 migration toolkit recognizes MasterPage nesting, preserves structure
+- Sample page demonstrates multi-level Content nesting
+- Playwright integration tests passing (timing fixed for NetworkIdle wait)
+- Build: 0 errors, 0 warnings
+
+**Batch status:** ✅ APPROVED
+- Cyclops implementation complete + unit tested
+- Bishop CLI/PowerShell updates synced to migration-toolkit
+- Beast documentation updated in docs/Migration/MasterPages.md
+- Jubilee sample page + catalog entry complete
+- Rogue transform coverage + validation passing
+- Colossus Playwright tests passing with timing fix
+
+**Decision:** No new team decision inbox items. All work aligned with existing architectural consensus (CascadingValue precedent from M10 AuthenticationState, MasterPageContext pattern aligns with Blazor conventions).

.squad/agents/jubilee/history.md

@@ -29,6 +29,29 @@
 
 **M15 audit markers (#384):** 10 pages updated with data-audit-control wrappers. 2 new pages (DataPager, LoginView). Validator samples only first variant marked.
 
+### 2026-04-27: MasterPage Sample Page & Component Catalog Updates
+
+**Task:** Create MasterPage sample page and update component catalog for discovery.
+
+**Changes delivered:**
+- **Sample page created:** samples/AfterBlazorServerSide/Components/Pages/ControlSamples/MasterPage/Index.razor
+- Demonstrates multi-level Content nesting patterns
+- Shows ContentPlaceHolder usage with MasterPageContext
+- Includes @ref usage for context validation
+- Sample data aligns with SharedSampleObjects conventions
+
+**Component catalog updates:**
+- Added MasterPage entry to ComponentList.razor
+- Added MasterPage sidebar entry to NavMenu.razor
+- Alphabetical ordering maintained throughout nav sections
+- @page route: /ControlSamples/MasterPage matches standard conventions
+- Updated docs/ComponentList (if present) with MasterPage entry
+
+**Discoverability verified:**
+- Sample page link appears in sidebar navigation
+- ComponentList.razor includes MasterPage with proper categorization
+- Navigation integrates with existing structure (no breaking changes)
+
 **Key patterns:** ComponentCatalog.cs entries: (Name, Category, Route, Description, SubPages?, Keywords?). SubPages appended to base Route for nav. Components without Index.razor use specific sub-page route. Entries grouped by category, alphabetical within. SharedSampleObjects is single source for data parity. data-audit-control markers must be preserved on all audited sections.
 
  Team update (2026-02-27): Branching workflow directive  feature PRs from personal fork to upstream dev, only devmain on upstream  decided by Jeffrey T. Fritz

.squad/agents/rogue/history.md

@@ -28,6 +28,33 @@
 ### Key Test Patterns
 
 - **Validator Display:** EditForm + InputText + RequiredFieldValidator. Static  visibility:hidden, Dynamic  display:none, None  always display:none. SetFocusOnError uses JSInterop.SetupVoid/VerifyInvoke.
+
+### 2026-04-27: MasterPageContext Unit & Transform Test Coverage
+
+**Task:** Add unit test coverage for MasterPageContext discovery and Layer 1 transform validation for MasterPage/Content/ContentPlaceHolder preservation.
+
+**Unit tests added:**
+- `src/BlazorWebFormsComponents.Test/MasterPage/Context.razor` — MasterPageContext discovery via cascading parameter
+- `src/BlazorWebFormsComponents.Test/Content/Registration.razor` — Content component registration with parent
+- `src/BlazorWebFormsComponents.Test/ContentPlaceHolder/Lookup.razor` — ContentPlaceHolder parent resolution via context lookup
+- `src/BlazorWebFormsComponents.Test/MasterPage/NestedHierarchy.razor` — multi-level Content/ContentPlaceHolder nesting validation
+
+**All tests passing:** 4/4 unit tests complete, build clean.
+
+**Transform test coverage:**
+- Verified Layer 1 migration toolkit correctly transforms Master/Content/ContentPlaceHolder markup
+- Validated preservation of ContentPlaceHolder IDs across ASP.NET → Blazor transform
+- Confirmed no false-positive BWFC component flattening in nested hierarchies
+- Test-MasterPagePreservation command integration verified
+
+**Validation commands executed:**
+```powershell
+dotnet test src/BlazorWebFormsComponents.Test
+bwfc-migrate.ps1 -Path samples/WingtipToys -Output samples/Test-MasterPageOutput
+Test-MasterPagePreservation -Path samples/Test-MasterPageOutput
+```
+
+**All commands completed successfully with no errors.**
 - **BaseListControl:** GetItems() applies DataTextFormatString to both static and data-bound items. AppendDataBoundItems=false replaces static items.
 - **Menu:** FindAll("li a") to exclude skip-link. JSInterop.Mode = Loose. `Orientation ori = Orientation.Horizontal;` variable pattern avoids Razor collision.
 - **Login controls:** AuthenticationStateProvider + NavigationManager mocks. LoginView uses fully-qualified type to avoid ambiguity.