feat: support local ARM64 VRT on macOS - #40
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Apple Silicon developers can run VRT through actiond's local Linux ARM64 VM. Add
target_arch = "arm64", matching execution/input platforms, and pinned Chromium, Node, and Noble system packages. Existing callers default to x64; mixed runtime/platform architectures fail early.The macOS setup script builds the signed upstream worker and runs native/gallery capture, comparison, isolation, update protection, deadlines, and cancellation recovery. No additional actiond patches are needed. Fix reruns when the previous worker copy is read-only.
Add a macOS ARM64 GitHub Actions build smoke check for the runtime, signed worker, and capture/comparison inputs. GitHub-hosted Macs cannot run nested VMs, so full VM execution remains locally verified and requires a physical Mac runner for CI.
Validation: full VRT integration suite passed on Apple Silicon/macOS 26.6.2; 22 repository test targets passed with one Linux-only test skipped. The CI build-only command and actionlint passed locally. Earlier Linux validation passed all 23 targets, BCR smoke, and both runtime builds. ARM64/amd64 pixel equivalence remains unverified; isolated ordinary E2E/component tests still require amd64 launcher tools.