Syncs this Solana Agent Kit plugin standalone mirror with the canonical
monorepo source. Last mirror update was Apr 5; v1.8.0 is now live on npm.

v1.8.0 changes:
- 4 new actions: MADEONSOL_WALLET_{STATS,PNL,POSITIONS,TRADES}_ACTION
- tools/index.ts gains walletStats/Pnl/Positions/Trades thin wrappers
- New actions/wallet.ts with zod schemas matching the API param surface
- Universal Wallet section in README

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>