docs(11-02): complete HTML export branding injection plan

- SUMMARY.md created for 11-02 plan
- STATE.md updated with decisions and progress
- ROADMAP.md updated with phase 11 plan progress (3/4 summaries)

.planning/STATE.md

@@ -3,14 +3,14 @@ gsd_state_version: 1.0
 milestone: v2.2
 milestone_name: Report Branding & User Directory
 status: completed
-stopped_at: Completed 11-01-PLAN.md — ReportBranding model and BrandingHtmlHelper
-last_updated: "2026-04-08T12:35:43.420Z"
+stopped_at: Completed 11-02-PLAN.md — HTML export branding injection
+last_updated: "2026-04-08T12:46:42.149Z"
 last_activity: 2026-04-08 — Phase 11 planning completed
 progress:
   total_phases: 5
   completed_phases: 1
   total_plans: 7
-  completed_plans: 4
+  completed_plans: 6
 ---
 
 # Project State
@@ -60,6 +60,8 @@ Decisions are logged in PROJECT.md Key Decisions table.
 - [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
+- [Phase 11-html-export-branding]: branding parameter placed AFTER CancellationToken ct in WriteAsync — existing positional callers unaffected
+- [Phase 11-html-export-branding]: MakeBranding helper added locally to each test class — test files stay self-contained
 
 ### Pending Todos
 
@@ -74,7 +76,7 @@ None.
 
 ## Session Continuity
 
-Last session: 2026-04-08T12:35:43.418Z
-Stopped at: Completed 11-01-PLAN.md — ReportBranding model and BrandingHtmlHelper
+Last session: 2026-04-08T12:46:37.894Z
+Stopped at: Completed 11-02-PLAN.md — HTML export branding injection
 Resume file: None
 Next step: `/gsd:execute-phase 11`