Add Arc Testnet auto proof polling

[horn111]

Description

Adds Auto Proof Polling for Arc Receipts.

The demo can now watch Arc Testnet Memo logs for the generated memo payment request and automatically attach onchain proof when a matching transaction appears. Manual tx hash verification remains available as a fallback.

Changes

• Added findMemoPaymentProof() SDK helper for read-only Memo-log polling.
• Exported polling types and helper from receipts and root SDK exports.
• Added POST /api/receipts/proof/watch.
• Added Watch Arc Testnet UI flow in the Onchain Proof panel.
• Updated docs, README, demo script, grant snapshot, and roadmap.

Testing

• npm.cmd run typecheck
• npm.cmd run build --workspace=packages/sdk
• npm.cmd run test --workspaces --if-present -- --reporter=dot
• node_modules\.bin\tsc.cmd --noEmit --project apps/demo/tsconfig.json --incremental false
• git diff --check
• next build via W: path alias

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Project	Deployment	Actions	Updated (UTC)
arc-nano-kit-demo	Ready	Preview, Comment	Jul 2, 2026 8:31pm