* Add version-matched bundled skill guides
* Clarify skill freshness rollout PRs
* Add canonical skills show alias
* fix(skills): address guide review feedback
* fix(skills): make guide commands cross-platform
* fix(skills): apply the ORCA convention to the emulator guides
Review follow-up: the emulator guides still instructed literal
`orca emulator ...` in sh fences with no Linux disambiguation, so on
unmanaged Linux they could launch the GNOME screen reader — the exact
failure the executable-selection preamble prevents. Both emulator
guides now carry the preamble and ORCA placeholder across fences,
tables, and prose, and the cross-platform safety test covers all four
converted guides. Also replaces computer-use's "unless a block names a
shell" carve-out, which contradicted its own POSIX example, with the
unconditional placeholder rule.
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