bounded_probe_run collapses spawn failure and timeout into one None, so a venv
interpreter that exists but cannot be executed (PermissionError, ENOEXEC, fork
failure) was reported as "timed out before reporting import health" -- a bogus
warning on the git path and sys.exit(1) on the ZIP path -- and the
`except OSError: return {}` branch beneath it was dead. Let the Popen error
propagate (opt-in flag, default unchanged for the other probes) so "we could not
run our own probe" says nothing about the checkout and no longer blocks the
update, while a spawned child that hangs is still a verdict.
Restores the non-fatal test the earlier rewrite dropped, now driving the real
bounded_probe_run/Popen: red on the previous head, green here.
Review finding: spawn failure of the import probe reported as a fatal timeout.
The critical-module import probe (`_critical_module_import_failures`) imports
`run_agent`, whose module-level `load_hermes_dotenv()` resolves every enabled
external secret source. The main-process skip only lived in `hermes_cli.main`'s
own dotenv call (`load_external_secrets=sys.argv[1:2] != ["update"]`), so the
probe child ran op/bws/command helpers with a 120s per-source budget inside the
120s probe and a healthy install reported "critical-module probe still fails to
import after updating: timed out before reporting import health" (#110823).
Move the argv check into `_early_recovery._should_skip_external_secret_sources`,
which every dotenv load already consults, and stamp `sys.argv = ['hermes',
'update']` into the probe so its imports inherit the updater contract.
Invariant test spawns the real probe against a home whose configured helper
touches a marker: red on main, green here.
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.