DEFAULT_CONFIG changed 183 times in 30 days and nothing checked that a new
key reached the docs; /pause (the global emergency stop) went undocumented
for two months.
scripts/ci/check_docs_drift.py lists every DEFAULT_CONFIG leaf and every
registered slash command and finds the ones the docs never mention. A key is
documented by its dotted path, a placeholder path in inline code
(`auxiliary.<task>.timeout`, `display.pet.*`), or a YAML example nesting it
under its parents; a slash command by a `/name` row in
reference/slash-commands.md.
The 132 keys undocumented today are baselined in docs_drift_baseline.json;
tests/ci/test_docs_drift.py fails only on NEW gaps, so it never blocks an
unrelated PR, and documenting a baselined key never fails. Deterministic,
stdlib + repo imports, ~1s.
/pause is documented here, so the slash-command baseline starts empty.
contributing.md says what to do when the test fails.
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