v0.12.9

Changes

• Cap the auto-injected DOM page state at 64 KiB by default to reduce repeated text prompt cost on large pages.
• Add dom_max_bytes, BROWSER_USE_RS_DOM_MAX_BYTES, and BU_RS_DOM_MAX_BYTES controls; set to 0 to disable the cap.
• Filter valid action indices to the DOM rows actually shown to the model, so omitted [N] values cannot be used accidentally.
• Add DOM cap metadata for follow-up evaluation analysis.

Validation

• .venv/bin/maturin develop
• .venv/bin/python -m unittest discover -s tests
• .venv/bin/python -m compileall -q python tests bench
• cargo check -p bu-py
• cargo test -p bu-cdp -p bu-dom -p bu-browser
• .venv/bin/python bench/release_preflight.py