The .forgejo/workflows/ci.yml is the canonical CI definition.
The old .github/workflows/ci.yml was being mirrored to GitHub via
--mirror push, triggering GitHub Actions runs that fail because
FORGEJO_TOKEN and other Forgejo-specific secrets are not set there.
GitHub Actions does not process .forgejo/workflows/ so removing
this file stops the spurious GitHub runs. ISSUE_TEMPLATE and
pull_request_template.md are preserved in .github/.
FORGEJO_TOKEN secret injected via env var (not inline expression) to
avoid CI injection risk; git insteadOf redirect authenticates the
git+https:// circuitforge-core VCS URL at install time.
