The addresses in the donation block were never real. The Bitcoin one fails its
bech32 checksum and Blockstream rejects it outright; the Ethereum one fails
EIP-55 and belongs to an address with no history, so any wallet that lowercased
it before sending would have delivered real money to nobody; the Solana string
is not even base58 - its tail is the QWERTY top row typed backwards.

Verified before use: BTC bech32 valid and accepted by Blockstream, ETH EIP-55
exact with 16 outgoing transactions on-chain, SOL 32 bytes owned by the System
Program with a live balance.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

- Check if node_name is provided before attempting execution
- Show available nodes in error message when node not found
- Prevents ValueError with 'None' node name

refactor: remove browser extension and build artifacts from plugin repo; plugin should only contain gateway code