* feat(ci): add HCP reusable workflows and drop Mergify
Callers can pin org Fargate/SPA CD and parallel CI instead of copying per-repo deploy jobs.
* chore(ci): remove deprecated PR policy reusable
policy / pr is no longer a required check. Drop the callable, its unit tests, and the setup docs so callers stop pinning a retired gate.
The workflow-templates catalog offered starter workflows for only 7 of
the 12 reusable workflows in .github/workflows, so ci-python-app,
ci-typescript-frontend, ci-static, ci-dotnet and cd-mobile-ios were
invisible in the org's Actions > New workflow UI and had to be wired by
hand. Add a template + properties.json pair for each.
Each caller CI job is keyed `ci` so the check context resolves to the
`ci / ci` required by the org ruleset, and every reusable ref is pinned
to the same 40-char SHA the existing templates use. node-version: "24"
is passed on the three reusables that declare the input
(ci-typescript-frontend, ci-static, cd-mobile-ios); ci-python-app and
ci-dotnet do not declare it, so it is omitted there.
