feat: add project workspace data model

.superpowers/sdd/task-2-report.md

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+# Task 2 Report: Workbench Types And Project-Scoped Mock Data
+
+## What changed
+
+- Added the typed workbench domain model in `apps/web/src/features/workbench/types.ts`.
+- Added two project records and project-scoped workspace mock data in `apps/web/src/features/workbench/mockData.ts`.
+- Added coverage for dynamic projects, project-specific channels, channel ordering, and custom-link URL shape in `apps/web/src/features/workbench/mockData.test.ts`.
+- Kept the implementation scoped to the requested workbench data and test files. No UI components, React dependencies, or shadcn/ui dependencies were changed.
+
+## Tests
+
+- Targeted test: `npm test -- --run src/features/workbench/mockData.test.ts` -> 1 file passed, 2 tests passed.
+- Full Web test suite: `npm test -- --run` -> 4 files passed, 7 tests passed.
+- Web production build: `npm run build` -> successful.
+- Formatting/diff validation: `git diff --check` -> no issues.
+
+## TDD evidence
+
+1. Created `mockData.test.ts` before production implementation.
+2. Ran the targeted test and observed the expected red result: Vitest could not resolve `./mockData` because the implementation files did not exist.
+3. Added `types.ts` and `mockData.ts` using the exact task brief values.
+4. Re-ran the targeted test and observed green: 2/2 tests passed.
+5. Ran the full Web test suite and build successfully.
+
+## Files changed
+
+- `apps/web/src/features/workbench/types.ts`
+- `apps/web/src/features/workbench/mockData.ts`
+- `apps/web/src/features/workbench/mockData.test.ts`
+- `.superpowers/sdd/task-2-report.md`
+
+## Self-review
+
+- `ChannelType` contains all seven required channel literals in the specified order.
+- `ProjectWorkspace` includes all required project-scoped collections.
+- Both projects receive distinct channel IDs, item IDs, and custom-link URLs through the project ID interpolation.
+- `getProjectWorkspace` returns the requested workspace and preserves the brief's fallback to the first workspace for unknown IDs.
+- The test verifies at least two projects, numeric IDs, names, distinct workspace IDs, channel order, and custom-link URL format.
+- No unrelated tracked files were changed.
+
+## Concerns
+
+- Vitest and Vite report the pre-existing warning that no Svelte config was found in `apps/web`; it did not prevent tests or the build from succeeding.
+- The mock data is intentionally static and duplicated across projects via the shared workspace mapper, as required for this MVP task.