docs(11-01): complete ReportBranding and BrandingHtmlHelper plan

- Create 11-01-SUMMARY.md with execution results
- Update STATE.md: decisions, progress, session continuity
- Update ROADMAP.md: phase 11 in progress (1/4 plans complete)
- Mark BRAND-05 requirement complete in REQUIREMENTS.md

.planning/STATE.md

@@ -2,15 +2,15 @@
 gsd_state_version: 1.0
 milestone: v2.2
 milestone_name: Report Branding & User Directory
-status: planning
-stopped_at: Completed 10-branding-data-foundation/10-03-PLAN.md
-last_updated: "2026-04-08T10:40:19.677Z"
-last_activity: 2026-04-08 — Roadmap created for v2.2
+status: completed
+stopped_at: Completed 11-01-PLAN.md — ReportBranding model and BrandingHtmlHelper
+last_updated: "2026-04-08T12:35:43.420Z"
+last_activity: 2026-04-08 — Phase 11 planning completed
 progress:
   total_phases: 5
   completed_phases: 1
-  total_plans: 3
-  completed_plans: 3
+  total_plans: 7
+  completed_plans: 4
 ---
 
 # Project State
@@ -24,13 +24,13 @@ See: .planning/PROJECT.md (updated 2026-04-08)
 
 ## Current Position
 
-Phase: 10 (not started)
-Plan: —
-Status: Roadmap ready — awaiting phase planning
-Last activity: 2026-04-08 — Roadmap created for v2.2
+Phase: 11 (planned, ready to execute)
+Plan: 4 plans (11-01 through 11-04) in 3 waves
+Status: Phase 10 complete, Phase 11 planned — ready to execute
+Last activity: 2026-04-08 — Phase 11 planning completed
 
 ```
-v2.2 Progress: [░░░░░░░░░░] 0% (0/5 phases)
+v2.2 Progress: [██░░░░░░░░] 20% (1/5 phases, 3/7 plans)
 ```
 
 ## Accumulated Context
@@ -58,6 +58,8 @@ Decisions are logged in PROJECT.md Key Decisions table.
 - [Phase 10-branding-data-foundation]: Used WPF PresentationCore (BitmapDecoder/TransformedBitmap/JpegBitmapEncoder) for image compression instead of System.Drawing.Bitmap — System.Drawing.Common is not available without a new NuGet package on .NET 10, and WPF PresentationCore is already in the stack
 - [Phase 10-branding-data-foundation]: LogoData is a non-positional record with init properties (not positional constructor) to avoid System.Text.Json deserialization failure
 - [Phase 10-branding-data-foundation]: No new using statements required for Phase 10 DI registrations — SharepointToolbox.Infrastructure.Persistence and SharepointToolbox.Services were already imported
+- [Phase 11-html-export-branding]: BrandingHtmlHelper is internal — only used within Services.Export namespace, tests access via InternalsVisibleTo
+- [Phase 11-html-export-branding]: InternalsVisibleTo added via MSBuild AssemblyAttribute ItemGroup in csproj
 
 ### Pending Todos
 
@@ -72,7 +74,7 @@ None.
 
 ## Session Continuity
 
-Last session: 2026-04-08T10:36:58.959Z
-Stopped at: Completed 10-branding-data-foundation/10-03-PLAN.md
+Last session: 2026-04-08T12:35:43.418Z
+Stopped at: Completed 11-01-PLAN.md — ReportBranding model and BrandingHtmlHelper
 Resume file: None
-Next step: `/gsd:plan-phase 10`
+Next step: `/gsd:execute-phase 11`