The v0.18.0 feature-spotlight verb was wired at the role-config, content-actions,
and route layers but never added to do_server's _TOOLS registry, so
_register_tools() (which registers only granted ∩ _TOOLS) silently dropped it —
a spawned Head of Marketing could NOT call propose_feature_spotlight, making the
feature non-functional as shipped. Added the do_server wrapper + _TOOLS entry
(mirroring propose_roadmap) and a regression test asserting every role-granted
do-tool is registered, so this class of gap can't recur.
