test: add mvp verification plan

docs/mvp-verification.md

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+# MVP Verification
+
+## Backend
+
+Run:
+
+```powershell
+Set-Location backend
+go test ./... -v
+```
+
+Expected: all backend tests pass.
+
+## PostgreSQL Integration
+
+Use this test database URL when live PostgreSQL verification is required:
+
+```text
+postgres://postgres:Weidong2023~!@8.137.107.29:19432/agent_dev?sslmode=disable
+```
+
+Do not hardcode this value into application source files. Pass it through `DATABASE_URL`.
+
+## Web
+
+The frontend is Svelte-only.
+
+Run:
+
+```powershell
+Set-Location apps/web
+npm test -- --run
+npm run build
+npx playwright test
+```
+
+Expected: component tests, production build, and smoke test pass.
+
+## Desktop
+
+Run:
+
+```powershell
+Set-Location apps/web
+npm run build
+Set-Location ../desktop
+npm run build
+```
+
+Expected: Tauri desktop bundle builds when Rust/Cargo is installed. On this machine, verification currently fails before compilation because `cargo` is not available in PATH.
+
+## Manual MVP Flow
+
+1. Open the client and enter the server IP or domain on the login screen.
+2. Create or log in as a private-deployment user.
+3. Create a project.
+4. Add text to project inbox.
+5. Click Analyze/Organize.
+6. Confirm one task and one note from the suggestion list.
+7. Assign the task to another system user.
+8. Explicitly share one note with the task.
+9. Search for text from the note body in global search.
+10. Open an AI session under the project and reference the note.
+11. Use Tauri quick capture to send text into the active project inbox.