Expand SDK automation capabilities

[jasonmatthewsuhari]

Summary

• Expands SDK automation contracts with app, keyboard, mouse, screen, window, clipboard, and filesystem reveal actions
• Adds adapter readiness reporting and public readiness types
• Wires OS-backed app/window/clipboard/reveal actions for Windows/macOS/Linux adapters
• Extends optional nut.js adapter for keyboard press, shortcuts, mouse click/double-click, movement, and screenshots
• Adds an opt-in Windows real automation smoke script while keeping normal tests safe

Tests

• npm run sdk:test
• npm run sdk:build
• npm run build
• npm audit --omit=dev

Issues

Refs #7, #8, #9, #10, #11, #12, #13, #14, #16

Notes

Real keyboard/mouse/screenshot automation still requires installing optional peer dependency @nut-tree-fork/nut-js and explicitly setting FLUENT_REAL_AUTOMATION=1 before running the smoke script.