docs(13-01): complete user directory model and service extension plan

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.planning/phases/13-user-directory-viewmodel/13-01-SUMMARY.md

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+---
+phase: 13-user-directory-viewmodel
+plan: 01
+subsystem: api
+tags: [microsoft-graph, user-directory, wpf, csharp]
+
+requires:
+  - phase: 10-branding-data-foundation
+    provides: GraphDirectoryUser model, GraphUserDirectoryService, IGraphUserDirectoryService
+provides:
+  - GraphDirectoryUser with UserType property for client-side member/guest filtering
+  - IGraphUserDirectoryService.GetUsersAsync with includeGuests parameter
+  - Graph filter branching (members-only vs all users)
+affects: [13-02-PLAN, user-directory-viewmodel]
+
+tech-stack:
+  added: []
+  patterns: [default-parameter backward compat, Graph filter branching]
+
+key-files:
+  created: []
+  modified:
+    - SharepointToolbox/Core/Models/GraphDirectoryUser.cs
+    - SharepointToolbox/Services/IGraphUserDirectoryService.cs
+    - SharepointToolbox/Services/GraphUserDirectoryService.cs
+    - SharepointToolbox.Tests/Services/GraphUserDirectoryServiceTests.cs
+
+key-decisions:
+  - "UserType added as last positional parameter to preserve backward compat for existing callers"
+  - "includeGuests defaults to false so all existing call sites compile unchanged"
+  - "userType always in Graph Select array regardless of includeGuests value"
+
+patterns-established:
+  - "Default parameter backward compat: new optional params added with defaults matching prior behavior"
+
+requirements-completed: [UDIR-03]
+
+duration: 2min
+completed: 2026-04-08
+---
+
+# Phase 13 Plan 01: User Directory Model & Service Extension Summary
+
+**Extended GraphDirectoryUser with UserType property and added includeGuests filter parameter to GraphUserDirectoryService for client-side member/guest filtering**
+
+## Performance
+
+- **Duration:** 2 min
+- **Started:** 2026-04-08T14:00:08Z
+- **Completed:** 2026-04-08T14:01:51Z
+- **Tasks:** 3
+- **Files modified:** 4
+
+## Accomplishments
+- Added string? UserType as last positional parameter to GraphDirectoryUser record
+- Added bool includeGuests = false parameter to IGraphUserDirectoryService.GetUsersAsync with Graph filter branching
+- Updated MapUser to populate UserType from Graph User object with userType always in Select array
+- Added 2 new tests (MapUser_PopulatesUserType, MapUser_NullUserType) and updated 2 existing tests with UserType assertions
+
+## Task Commits
+
+All three tasks committed atomically (single plan scope):
+
+1. **Tasks 1-3: Model + Service + Tests** - `9a98371` (feat)
+
+**Plan metadata:** [pending]
+
+## Files Created/Modified
+- `SharepointToolbox/Core/Models/GraphDirectoryUser.cs` - Added UserType as 6th positional parameter
+- `SharepointToolbox/Services/IGraphUserDirectoryService.cs` - Added includeGuests parameter with XML docs
+- `SharepointToolbox/Services/GraphUserDirectoryService.cs` - Filter branching, userType in Select, MapUser UserType mapping
+- `SharepointToolbox.Tests/Services/GraphUserDirectoryServiceTests.cs` - Updated 2 existing tests, added 2 new UserType tests
+
+## Decisions Made
+- UserType added as last positional parameter (string?) so existing construction sites only need one additional argument
+- includeGuests defaults to false preserving all existing call sites unchanged (backward compatible)
+- userType always included in Graph Select array regardless of includeGuests flag, so MapUser always has data
+
+## Deviations from Plan
+
+None - plan executed exactly as written.
+
+## Issues Encountered
+None.
+
+## User Setup Required
+None - no external service configuration required.
+
+## Next Phase Readiness
+- GraphDirectoryUser now carries UserType for Phase 13-02 in-memory member/guest filtering
+- IGraphUserDirectoryService.GetUsersAsync ready for ViewModel to call with includeGuests=true
+- All 7 unit tests pass, 4 integration tests skipped (expected - require live tenant)
+
+---
+*Phase: 13-user-directory-viewmodel*
+*Completed: 2026-04-08*