docs: add live demo walkthrough

DEMO.md

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+# ProofWorks Live Demo
+
+Live demo: https://proofworks-genlayer.vercel.app
+
+This walkthrough shows the shortest happy path through the ProofWorks GenLayer escrow flow.
+
+1. Open https://proofworks-genlayer.vercel.app in a browser.
+   The docket and escrow summary are readable without a wallet, so you can inspect existing cases first.
+
+2. Connect a wallet or use a burner account.
+   Use the wallet button if you have an injected wallet available, or choose the burner flow and switch between Creator and Worker roles for a local smoke test.
+
+3. Create a task.
+   As Creator, open the create-case form and enter a small task such as:
+   - Title: `Frontend smoke oath`
+   - Description: `Test the ProofWorks demo flow.`
+   - Acceptance criteria: `The proof text must say done.`
+   - Evidence type: `TEXT_SUBMISSION`
+   - Reward: `1`
+   Then submit the task and wait for the transaction to be accepted.
+
+4. Submit proof.
+   Switch to the Worker role, select the new task from the docket, and submit `done` as the proof text. The case should move from open or claimed state into submitted state.
+
+5. Run the AI jury.
+   Select the submitted task and run the AI jury/evaluation action. When the transaction is accepted, the verdict panel should show the decision, score, payout percentage, confidence, and reason.
+
+6. Finalize the case.
+   If the verdict approves the proof, click the finalize action. The UI waits for finalization because the payout/refund transfer happens only after the finalize transaction reaches the finalized state.
+
+7. Review the result.
+   After finalization, the task should show a paid or finalized status, the active escrow summary should update, and the submitted proof plus verdict should remain visible in the task detail panel.
+
+For a GitHub PR demo instead of a text submission, create a case with GitHub PR evidence, submit a public pull request URL as proof, then run the same AI jury and finalization steps.