* Speed up PR CI with per-job path skips and native caches
Skip git-compat, xterm, packaging, and shell jobs when their inputs are
unchanged, reuse the composite install action (including Windows node-pty
cache), skip compiling the Windows CLI launcher on a cache hit, and cut the
test matrix from 16x2 to 8x2 shards without dropping coverage.
* Widen PR job skip prefixes for orcad browser and live shells
Chrome session/tab modules and zsh/fish wrapper templates are inputs to
required jobs the classifier previously skipped. Include that implementation
graph so those jobs still run when the files they load change.
* Fix CI cache safety and required gates
* Build scriptless Windows addons explicitly
* Preserve node-pty Windows support prebuild
* Remove duplicated Windows launcher unit lane
A cancelled Skill update round trip on a README merge painted main red
because push to main had no path filter. Share the PR path list on
push, and skip expensive PR Checks when every changed file is docs.
Neil