Consolidates on top of the concurrent browser_tool compat-removal commits (de60f789a7, 912a497ce2, da7ee6353e, 69eb1feb3e): the facade no longer re-exports any browser_tool_* sibling name; hermes_cli/update_cmd_deps.py's internal import (not its exported surface) and tests/hermes_cli/test_cmd_update.py patch targets now point at tools.browser_tool_install.
For each issue anchor present in BASE 63279301bc non-test .py and absent on HEAD, the BASE comment/docstring block was re-attached at the HEAD location of the code it explained (matched by the distinctive code line / enclosing def). Sentences already covered by an existing HEAD comment were deduped; the issue number always survives. Insert-only: no code lines changed.
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