merge: bring main (skills docs) into hero-facade-0.3.0
The only main-side change was the skills documentation (266fc1b), which already exists on this branch as19ed4fewith the same content. MEMORY.md conflicted because the two skills commits were appended to different bases; the branch's version is a strict superset (it also carries the vehicle/site/tools/hero entries), so it is kept.
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