Add Autohand Code CLI agent support

[igorcosta]

Summary

• add Autohand Code CLI to Orca's launchable TUI agent type/config/catalog
• launch Autohand interactively and inject the composed prompt after startup so Orca keeps the hosted session alive
• add Autohand Code to the README supported-agent badges, including localized README copies

Verification

• pnpm exec vitest run --config config/vitest.config.ts src/renderer/src/lib/tui-agent-startup.test.ts
• pnpm exec tsc --noEmit -p config/tsconfig.node.json --composite false
• pnpm exec tsc --noEmit -p config/tsconfig.cli.json --composite false
• pnpm exec tsc --noEmit -p config/tsconfig.web.json --composite false
• pnpm exec oxlint src/shared/types.ts src/shared/tui-agent-config.ts src/renderer/src/lib/agent-catalog.tsx src/renderer/src/lib/agent-status.ts src/renderer/src/lib/tui-agent-startup.test.ts

Note: dependency install was run under local Node 25 while the repo declares Node 24; install completed, but native optional build output warned about the engine mismatch. The targeted test, lint, and typechecks above passed.