docs: define organization account model

docs/TASKS/organizations/004-workspace-selector-organization-switcher.md

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+# Task: Workspace selector organization switcher
+
+## Feature
+
+`docs/FEATURES/organizations.md`
+
+## Goal
+
+Keep the existing workspace selector as the primary context selector and add an organization switcher at the bottom.
+
+## Context
+
+The current workspace selector UX is good. The missing concept is that workspaces belong to organizations. Users may have access to multiple organizations and different workspaces under each one.
+
+## Scope
+
+- Load the current user's accessible organizations.
+- Show the current organization at the bottom of the existing workspace selector.
+- Allow users to switch organizations.
+- Scope or group listed workspaces by the selected organization.
+- Preserve current workspace selection behavior where possible.
+- When switching organizations, select a sensible workspace for that organization or route to an organization/workspace selection state.
+- Provide links from the organization switcher to organization settings routes when the user has access.
+- Add English and French locale strings.
+
+## Constraints
+
+- Do not redesign the authenticated app shell.
+- Do not turn the selector into a marketing or onboarding page.
+- Preserve workspace as the primary day-to-day app context.
+- Preserve route-level auth and role checks.
+
+## Likely Files
+
+- `frontend/src/layouts/main/**`
+- `frontend/src/features/workspaces/**`
+- `frontend/src/features/organizations/**`
+- `frontend/src/stores/**`
+- `frontend/src/locales/en.json`
+- `frontend/src/locales/fr.json`
+
+## Done When
+
+- [ ] Workspace selector shows the active organization.
+- [ ] Users can switch organizations from the selector.
+- [ ] Workspace list reflects the selected organization.
+- [ ] Organization settings links appear only when permitted.
+- [ ] Existing workspace switching behavior remains usable.
+- [ ] UI strings exist in English and French.
+- [ ] Frontend build passes.
+
+## Validation Commands
+
+```bash
+cd frontend
+npm run build
+```