Update ROADMAP and CHANGELOG for v0.2.5 additional work

Add entries for welcome surface, user default surface preference,
admin UserMenu, dead settings removal, and default surface routing.

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

CHANGELOG.md

@@ -4,6 +4,33 @@ All notable changes to Switchboard Core are documented here.
 
 ## [Unreleased] — v0.2.5
 
+### Added
+
+- **Welcome surface**: New core surface shown when no extensions are installed.
+  Displays topbar + welcome card with "Go to Packages" link for admins.
+  Replaces `/admin` as the final fallback, breaking the back-button loop.
+- **User default surface**: Users can set a personal landing page in
+  Settings > General, overriding the admin-configured global default.
+- **UserMenu in admin topbar**: Replaced Back button with UserMenu,
+  providing consistent surface navigation and eliminating infinite loops.
+- **Package manifest icons**: Added emoji icons to hello-dashboard,
+  icd-test-runner, sdk-test-runner, and team-activity-log manifests.
+- **PoC documentation**: README.md for tasks and schedules packages
+  documenting Proof of Concept status and graduation criteria.
+
+### Changed
+
+- **Default surface resolution**: Priority chain is now
+  user preference → global config → first extension → `/welcome`.
+- **User settings General section**: Replaced dead chat fields (Default
+  Model, System Prompt, Max Tokens, Temperature, Show Thinking) with
+  a Default Surface dropdown.
+- **Admin settings**: Removed dead chat sections (System Prompt, Default
+  Model, Policies, Web Search, Auto-Compaction, Memory Extraction).
+- Updated bus doc examples and test labels from `chat.*` to `workflow.*`.
+- Renamed `channel-` prefixed test paths to `test-` in storage tests.
+- Updated doc comments throughout to remove references to gutted surfaces.
+
 ### Removed
 
 - **~500 lines of dead CSS**: Orphaned classes for gutted chat, channel,
@@ -19,24 +46,10 @@ All notable changes to Switchboard Core are documented here.
   `sw-notes-pane.css`, `chat.css`. Orphaned `chat-pane.html` component.
 - **Vestigial guards**: `"chat"` surface checks in `IsSurfaceEnabled()` and
   `DisablePackage()` (chat is no longer a surface).
+- **Dead settings UI**: Chat defaults from user settings, System Prompt /
+  Default Model / Policies / Web Search / Compaction / Memory from admin.
 - Unused `fmt.Sprintf` references in team stores.
 
-### Changed
-
-- **Settings heading**: "Chat Defaults" renamed to "Defaults" in user settings.
-- Guard `sw.api.models.enabled()` call to prevent crash when no providers
-  are configured.
-- Updated bus doc examples and test labels from `chat.*` to `workflow.*`.
-- Renamed `channel-` prefixed test paths to `test-` in storage tests.
-- Updated doc comments throughout to remove references to gutted surfaces.
-
-### Added
-
-- **Package manifest icons**: Added emoji icons to hello-dashboard, icd-test-runner,
-  sdk-test-runner, and team-activity-log manifests.
-- **PoC documentation**: README.md for tasks and schedules packages documenting
-  Proof of Concept status and graduation criteria.
-
 ---
 
 ## [Unreleased] — v0.2.4