feat(app): add HandsFree computer use extension

[benjaminshafii]

Summary

• add @openwork/handsfree as a non-UI package with the native macOS computer-use runtime
• expose semantic AX refs, strict background mode, postToPid input, background activation, screenshots, and CUA compatibility tools
• register HandsFree Computer Use as an MCP-backed OpenWork extension and resolve its local dev command from desktop IPC

Integration Direction

• Recommended path: ship HandsFree as a local MCP-backed extension in the existing Extensions surface. This keeps OpenWork's extension model consistent while letting the native runtime remain reusable.
• Alternative considered: embed it directly into the desktop process. Rejected for now because macOS permissions, Swift build output, and long-running computer-use sessions are cleaner behind a separate process.
• Future follow-up: add a richer config slot for permission diagnostics and strict-mode toggles once the extension is connected.

Testing

• pnpm --filter @openwork/handsfree check
• pnpm --filter @openwork/app typecheck
• MCP wrapper smoke test: initialize + tools/list via node packages/handsfree/bin/openwork-handsfree-computer-use.mjs mcp

Notes

• No video attached: the full flow requires macOS Accessibility and Screen Recording permissions plus a target app/window. The smoke test verifies server startup and tool registration; native build verifies the Swift runtime.
• Swift emits expected deprecation warnings for CGWindowListCreateImage; this PR intentionally uses that API for the target-window capture path.

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