docs: create milestone v2.3 roadmap (5 phases, 15-19)

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

.planning/phases/14-user-directory-view/14-RESEARCH.md

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+# Phase 14 Research: User Directory View
+
+## What Exists (Phase 13 Deliverables)
+
+### ViewModel Properties for Directory Browse
+- `IsBrowseMode` (bool) — toggles Search/Browse mode
+- `DirectoryUsers` (ObservableCollection<GraphDirectoryUser>) — raw directory list
+- `DirectoryUsersView` (ICollectionView) — filtered/sorted view, default sort DisplayName asc
+- `IsLoadingDirectory` (bool) — true while loading
+- `DirectoryLoadStatus` (string) — "Loading... X users" progress text
+- `IncludeGuests` (bool) — in-memory member/guest filter
+- `DirectoryFilterText` (string) — text filter on DisplayName, UPN, Department, JobTitle
+- `DirectoryUserCount` (int) — filtered count
+- `LoadDirectoryCommand` (IAsyncRelayCommand) — disabled while loading
+- `CancelDirectoryLoadCommand` (RelayCommand) — enabled only while loading
+
+### Existing People-Picker (Search Mode)
+- `SearchQuery` → debounced Graph search → `SearchResults` dropdown
+- `AddUserCommand(GraphUserResult)` → `SelectedUsers` collection
+- `RemoveUserCommand(GraphUserResult)` → removes from SelectedUsers
+- `RunCommand` → `RunOperationAsync` → audits SelectedUsers against GlobalSites
+
+### GAP: No SelectDirectoryUserCommand
+SC2 requires "selecting a user from directory list launches existing audit pipeline."
+Need a command that:
+1. Takes a `GraphDirectoryUser` from the directory DataGrid
+2. Converts it to `GraphUserResult` (same DisplayName + UPN)
+3. Adds to `SelectedUsers` via existing `ExecuteAddUser` logic
+This is ViewModel work — needs to be done before the View XAML.
+
+### Current View Structure (UserAccessAuditView.xaml)
+- Left panel (290px DockPanel): Users GroupBox + Options GroupBox + Buttons StackPanel
+- Right panel: Summary banners + Filter/Toggle row + DataGrid (ResultsView)
+- Status bar: ProgressBar + StatusMessage
+
+### Available Converters
+- `BoolToVisibilityConverter` — true→Visible, false→Collapsed
+- `InverseBoolConverter` — inverts bool
+- `StringToVisibilityConverter` — non-empty→Visible, empty→Collapsed
+
+### Localization
+- No directory.* keys exist — need to add ~10 keys for EN + FR
+
+## Plan Breakdown
+
+1. **14-01** (Wave 1): Add localization keys + `SelectDirectoryUserCommand` on ViewModel + code-behind event handler
+2. **14-02** (Wave 2): Full XAML changes — mode toggle, conditional Search/Browse panels, directory DataGrid, loading UX