The port is only half of it. Ships the skill that tells the agent the
capability exists, when reaching for it beats reading .tsx, and how not
to hurt the user's running app while using it.
Lands in skills/software-development/ next to node-inspect-debugger,
which covers the same protocol for Node/perf work — this one is the
DOM/CSS half.
Load-bearing parts: don't relaunch or kill the user's app to get a port
(a mid-serve kill nukes Chromium's socket pool and the fallout gets
blamed on the last CSS edit); never dump the whole DOM into context;
prefer the maintained SELECTORS map to invented querySelectors; and
CDP answers factual questions only — whether it *looks* right is still
the user's call.
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