fix(marketing): Safari gets the arm64 Mac download

[t3dotgg]

Safari on Apple Silicon reports its WebGL renderer as Apple GPU. The homepage treated that value as unknown and selected the x64 DMG, so M-series Macs downloaded the Intel build.

The detector now classifies Safari’s generic Apple GPU renderer as arm64 after it checks explicit Intel, AMD, Radeon, Nvidia, and GeForce markers. An unavailable renderer still falls back to x64. A focused test covers the Safari value.

Tested with:

• vp test run apps/marketing/src/lib/macArch.test.ts
• vp run --filter @t3tools/marketing typecheck

Created by GPT-5.6 using the Codex harness in T3 Code.

---

Note

Low Risk
Small change to client-side download arch detection on the marketing site; no auth, data, or backend impact.

Overview
Safari on Apple Silicon often reports WebGL as Apple GPU, which previously missed the Apple Silicon regex and fell through to the x64 default—so the marketing homepage could offer the Intel DMG on M-series Macs.

macArchFromGpuRenderer now treats apple gpu (alongside apple m* chips) as arm64, still after Intel/AMD/Nvidia-style markers so hybrid strings like ANGLE + Intel stay x64. Empty or unavailable renderer values still default to x64 for Intel compatibility. Tests split the Safari case from the empty-renderer fallback.

^{Reviewed by Cursor Bugbot for commit 231cc01. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Fix Safari browser to receive arm64 Mac download by matching 'Apple GPU' renderer

Safari reports Apple GPU as the WebGL renderer string instead of a specific chip name like Apple M1. The APPLE_SILICON_GPU_PATTERN regex in macArch.ts is expanded from \bapple\s+m\d to \bapple\s+(?:m\d|gpu)\b so Apple GPU now maps to arm64 instead of falling back to x64.

^{Macroscope summarized 231cc01.}

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[cursor]

Cursor Bugbot has reviewed your changes using high effort and found 1 potential issue.

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^{Reviewed by Cursor Bugbot for commit 231cc01. Configure here.}

[github-actions]

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	12.6 KiB	12.6 KiB	+11 B (+0.1%)	15.1 KiB	✅
Codex	Thread snapshot wire	6.3 KiB	6.3 KiB	+4 B (+0.1%)	7.3 KiB	✅
Codex	Live turn WebSocket wire	6.3 KiB	6.3 KiB	+7 B (+0.1%)	7.8 KiB	✅
Codex	Live turn WebSocket decoded	51.8 KiB	51.8 KiB	0 B (0.0%)	66.4 KiB	✅
Codex	Live turn messages	16	16	0 (0.0%)	21	✅
Claude	Total thread wire	12.6 KiB	12.6 KiB	+8 B (+0.1%)	15.1 KiB	✅
Claude	Thread snapshot wire	6.3 KiB	6.3 KiB	+1 B (+0.0%)	7.3 KiB	✅
Claude	Live turn WebSocket wire	6.3 KiB	6.3 KiB	+7 B (+0.1%)	7.8 KiB	✅
Claude	Live turn WebSocket decoded	52.7 KiB	52.7 KiB	0 B (0.0%)	66.4 KiB	✅
Claude	Live turn messages	16	16	0 (0.0%)	21	✅

Baseline: 324ddda · PR result: 231cc01 · Source CI: success

Scenario and decoded snapshot size

10 historical turns, 5 command tools per turn, 878.9 KiB retained MCP result per historical turn, and a 1.05 MiB retained result in the measured turn.

• Codex decoded thread snapshot: 99.9 KiB
• Claude decoded thread snapshot: 100.6 KiB

Updated in place by a trusted workflow. PR artifacts are strictly validated and never executed.

[macroscopeapp]

Approvability

Verdict: Not approved

Macroscope's review found this PR not approvable — This PR changes Safari's 'Apple GPU' renderer detection from x64 to arm64, affecting which Mac download users receive. An unresolved review comment raises a valid concern that Intel Safari users may receive incompatible arm64 builds, since 'Apple GPU' is reported on both Intel and Apple Silicon Macs.

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