aszc-dev 8382b13598 ci(phase4): tiered test/CI infrastructure (Tier 0/1/2) ...

Phase 4 of the modernization plan: institutionalize the 3-tier strategy
so future changes are guarded automatically, and pin down the
self-hosted M2 path the maintainer's hardware needs.

Tier dispatch
- Makefile targets test-unit / test-smoke / test-m2 / bench (plus
  ci-tier0 / ci-tier1 wrappers that echo env first). check-macos-arm
  fails fast on non-Apple-Silicon hosts.

Tier 1 smoke
- tests/smoke/test_synthetic_unet.py: builds a TinyUNet (conv-in,
  time/text projections, conv-out), traces it, ct.convert to
  mlprogram + fp16 CPU_ONLY, loads back via CoreMLModel and asserts
  expected_inputs + named output. Runs in ~2s; auto-skips on
  non-Apple-Silicon. Catches coremltools / ml-stable-diffusion API
  drift without needing a real SD checkpoint or the ANE.

GitHub Actions
- .github/workflows/tier0.yml: ubuntu-latest on every push/PR, ~10
  min budget, minimal-deps install (torch==2.0.1, numpy<1.25, pytest)
  -> pytest -m unit.
- .github/workflows/tier1.yml: macos-14 (M1) on push/PR; opt-in via
  run-tier1 label on labeled PRs to spare external-doc PRs.
- .github/workflows/tier2.yml: self-hosted [macOS, ARM64, coreml] on
  PR label run-m2 / nightly cron / workflow_dispatch. Starts ComfyUI
  with --cpu-vae, runs pytest -m m2 + bench/run.py, uploads bench
  results.

Integration coverage moved
- Removed tests/integration/test_basic_conversion_1_5.py: it required
  an MPS reference image (broken on macOS 26 + torch 2.0.1, see
  Phase 1 Gate) and a checkpoint the maintainer doesn't have on disk
  (dreamshaper_8). The same coverage now lives in
  tests/m2/test_golden_image.py: deterministic numerical pass/fail
  (SHA256 + PSNR fallback) against a stored golden, Core ML pipeline
  only. No more human eyeballing.

Docs
- docs/ci-m2.md: one-time runner registration steps, COMFY_DIR
  persistence, baseline model pre-conversion, trigger semantics, what
  to do when the runner is offline, and the migration note from
  integration -> m2 golden.

Sanity check
- Temporarily set convert_to="BREAKAGE_CANARY_NOT_A_REAL_FORMAT" in
  the smoke test; Tier 1 surfaced
  NotImplementedError: Backend converter BREAKAGE_CANARY_NOT_A_REAL_FORMAT not implemented
  immediately. Reverted.

Local verification
- make test-unit -> 88/88 passed in 2.09s
- make test-smoke -> 1/1 passed in 1.99s

2026-05-23 23:11:35 +02:00

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