Add Camoufox adapter

[assimelha]

Summary

• add a Camoufox backend selected with --engine camoufox / AGENT_BROWSER_ENGINE=camoufox
• launch a Python sidecar that drives Camoufox through Playwright and translates high-level agent-browser actions over line-delimited JSON
• embed the sidecar script in the Rust binary and materialize it at launch time for packaged builds
• preserve --state / AGENT_BROWSER_STATE when auto-launching Camoufox so imported cookies and storage are applied
• document AGENT_BROWSER_CAMOUFOX_PYTHON for environments where Camoufox is installed outside the default python3

Notes

This does not try to make Camoufox speak CDP. CDP-specific features such as tracing, profiling, DevTools inspect, and network interception remain Chrome-path functionality and return explicit unsupported errors when unmapped.

Validation

• python3 -m py_compile scripts/camoufox_adapter.py
• cargo check
• cargo build
• cargo test (699 passed, 70 ignored; plus 2 doctor CLI integration tests passed)
• real Camoufox smoke suite: open, snapshot refs, click ref navigation, form fill/eval, screenshot, and tab list
• embedded sidecar smoke: launched Camoufox from the materialized temp script and verified temp script cleanup
• Chrome-to-Camoufox state bridge: exported a Chrome profile state with system Google Chrome, loaded it into Camoufox, verified imported cookie counts, and round-tripped Camoufox state
• env auto-launch state bridge: verified AGENT_BROWSER_ENGINE=camoufox + AGENT_BROWSER_STATE=... loads a synthetic cookie and localStorage into Camoufox

[vercel]

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