A '# (6)!' annotation marker on a fully-commented YAML line made Material's
annotation JS swallow the whole line into the tooltip — so the commented
'# - ${MOUNTS_DIR...}' line disappeared, leaving an orphan marker with no
visible code (which is why '(6)' seemed missing).
Fix: drop the marker from the commented line, keep it as plain visible YAML
('# optional — see below'), and move its explanation to prose below the
annotation list. Renumber cache/volume markers 7->6, 8->7.
Verified in-browser: commented mounts line now renders visibly; no orphan
marker. build --strict clean.
Signed-off-by: disqualifier <dev@disqualifier.me>