* ci: move secondary, scheduled and contract workflows to GitHub-hosted runners
Public-repo standard hosted runners are free under Enterprise. Release, build,
benchmark, e2e and unit workflows stay on Blacksmith. ci-xterm-cache seeds both
cache stores since its PR consumer's pool is undecided.
* test(pi): resolve the smoke bundle's external packages from the repo
#34148 pulled zod into the commit-message planner graph; the bundle in the
OS temp dir could not resolve it on any runner.
* ci(unit): use four workers on the hosted four-core x64 runner
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Co-authored-by: OrcaWin <293788423+OrcaWin@users.noreply.github.com>