The router forbade suggesting skills when PROACTIVE is false while the preamble
told the model to ask 'want me to run it?'. Decision: false means never
auto-invoke and never suggest, including by asking. The preamble line in
generate-upgrade-check.ts now matches the router, and both quote the value
as `false`, the way gstack-skill-start prints it. Restore with
gstack-config set proactive true.
W7a pin: test/gen-skill-docs.test.ts:4488 used the old quoted sentence as a
preamble-order marker; it now finds the PROACTIVE-false rule with a
quote-tolerant, case-insensitive pattern.