docs: restore L2 review evidence (wallet-options screenshot + subscribe tx hash)

[abullaisi]

The Rise In Level 2 review came back Revisions Needed. Two evidence items were missing from current main:

• screenshots/wallet-options.png was referenced by the README table but the file itself was lost in the repo migration; restored from history.
• The L2 checklist requires a transaction hash of a contract call verifiable on Stellar Explorer; the README had contract IDs but no tx hash. Added a live subscribe tx on the deployed contract: https://stellar.expert/explorer/testnet/tx/bec74266a8dd505a2715126502bddf3c6cef2718107397c3e2ad4aa860e2f8a7 (first invocation on this deploy: 10 USDC in, subscribed event, epoch 2).

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Project	Deployment	Actions	Updated (UTC)
stellar-hackathon-web	Ready	Preview, Comment	Jul 17, 2026 2:37am

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⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

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Run ID: c67fef2b-baaf-4f05-8218-8ee77104570b

📥 Commits

Reviewing files that changed from the base of the PR and between d816b7f and fa0849f.

📒 Files selected for processing (1)

• README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/l2-evidence

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