[OrcaWin]

	Files	Added	Deleted	Net
Test	1	$\color{#1a7f37}{\Huge{\mathbf{+}}}$​1	$\color{#cf222e}{\Huge{\mathbf{−}}}$​3	$\color{#cf222e}{\Huge{\mathbf{−}}}$​2
Prod	2	$\color{#1a7f37}{\Huge{\mathbf{+}}}$​4	$\color{#cf222e}{\Huge{\mathbf{−}}}$​3	$\color{#1a7f37}{\Huge{\mathbf{+}}}$​1

Why

Each adhoc Mac arch job ran on blacksmith-12vcpu-macos-15 at about $0.16/min. About 3 of each job's ~7 minutes is idle wait on Apple's notary service. The CPU-bound parts are short: build:release:host takes ~38 s, and packaging plus signing an arch takes ~1 min. Those parts already run at the same speed on the hourly build's 6-vCPU Mac.

Measurement

Dispatched run 40616847370 built this branch with label=ci-6vcpu-trial and succeeded. The API confirms both arch jobs ran on blacksmith-6vcpu-macos-15. The 12-vCPU baseline is the last 4 main-YAML runs (40584479847, 40599134395, 40606281105, 40614169522).

	12 vCPU (baseline)	6 vCPU (this run)
Arch job	6.7–7.2 min	6.9 / 7.3 min
Build app	38 s	40–43 s
Package and notarize	258–287 s	271 / 304 s (notary variance)
Run wall time	21.7–25.0 min	21.3 min
Mac cost per run	~$2.24	~$1.20

At ~6 adhoc runs a day, this saves about $6.5/day with no measurable change in wall time. Parallel per-arch jobs stay, and so do signing, notarization, the ref vetting and the publication gates.

The runner label is pinned by mac-notarization-builder-contract.test.mjs, which this PR updates along with docs/readme/ci-runners.md.

Checks

• pnpm check:changed: passed.

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• .github/workflows/adhoc-mac-build.yml
• config/scripts/mac-notarization-builder-contract.test.mjs
• docs/readme/ci-runners.md

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