bridged.yaml is gitignored, so bridged.example.yaml is the only
committed description of the config schema. Two tests already covered
example -> code; nothing covered code -> example, so a brand-new key
could ship undocumented and no test would notice.
A new test compares BridgedConfig.KNOWN_TOP_LEVEL_KEYS against the
example scanned as TEXT, so a key documented only as a comment counts as
documented. That is what makes the guard correct rather than annoying:
most of the example is commented on purpose.
Verified here: added an undocumented key and watched the test fail with
an actionable message naming it; then documented that key as a comment
only and watched it pass. Probe reverted, tree clean.
Closes#96
Dai Ha
d5dd5639ae