docs(openspec): add OpenSpec changes for FN-005, FN-006, FN-008, FN-009, FN-010

- Add frontend-foundation change (FN-005) with 46 tasks
- Add deployment-config change (FN-006) with 27 tasks
- Add runfusion-poc/opencode-poc change (FN-008) with 25 tasks
- Add config-secrets change (FN-009) with 31 tasks
- Add codeserver-spawn change (FN-010) with 38 tasks
- Include project specsheet and configuration
- Archive completed deployment-config change

openspec/changes/archive/2026-05-14-frontend-foundation/specs/dashboard-shell/spec.md

@@ -0,0 +1,28 @@
+## ADDED Requirements
+
+### Requirement: Dashboard provides responsive layout
+The system SHALL provide a consistent layout with header, navigation, and content area.
+
+#### Scenario: Layout structure
+- **WHEN** the user views any authenticated page
+- **THEN** a header displays the application name and user avatar
+- **AND** a sidebar shows navigation links (Dashboard, Projects, Repositories, Tools, Settings)
+- **AND** the main content area renders the current route's component
+
+#### Scenario: Collapsible sidebar
+- **WHEN** the user is on a mobile device
+- **THEN** the sidebar is initially collapsed
+- **AND** a hamburger menu toggles the sidebar visibility
+
+### Requirement: Navigation reflects auth state
+The system SHALL show/hide navigation items based on authentication status.
+
+#### Scenario: Authenticated navigation
+- **WHEN** the user is authenticated
+- **THEN** all navigation links are visible
+- **AND** "Sign Out" is available in the user menu
+
+#### Scenario: Unauthenticated navigation
+- **WHEN** the user is not authenticated
+- **THEN** only "Sign In" is shown
+- **AND** accessing protected routes redirects to login