chore: release v0.7.101

[vanceingalls]

What

Stable release v0.7.101, covering the 5 commits since v0.7.100.

This is the release that starts the parallel drawElement router rollout. #2840 merged after v0.7.100 was cut, so the ramp has not reached anyone yet — publishing this is what activates it.

Behavioural change worth reading before merging

On publish, 5% of installs begin using the parallel capture path by default on eligible renders (drawElement-capable, ≥700 frames, auto multi-worker). Everyone else is unaffected.

Safety properties that ship with it:

• Per-render self-verify stays in front of output. In the last 14 days it caught 149 bad renders, 128 of them PSNR damage — that is what protects correctness, and it runs regardless of the ramp.
• Per-install circuit breaker stays. 154 of 155 reverting installs stop at exactly one revert.
• percentage: 0 in canaryRegistry.ts is a full fleet-wide revert with no release needed.
• HF_DE_PARALLEL_ROUTER=false opts a user out, =true opts in early. Explicit choice wins in both directions.

Ramp discipline after this ships

Hold at 5% until PRINFRA-372 resolves. --workers auto crashes every worker ("detached Frame" / "Target closed") on macOS arm64 while --workers 1 is clean, and the router forces 3 workers. PRINFRA-339 (indefinite stalls) and PRINFRA-354 (silent hang) are also open. None of those emit render_complete, so neither the self-verify nor the breaker catches them — a repro harness is attached to PRINFRA-372 and needs a ≤16 GB darwin/arm64 host.

At each step split revert rate by cpu_count and is_docker — the two segments with near-zero coverage in today's trial population. Baseline: routed renders fail at 2–3.4%, stable across versions.

Also in this release

• Studio: three editor crash-boundary trips fixed (fix(studio): stop three crash-boundary trips in the editor #3102)
• CLI: a set-but-empty HF_DE_PARALLEL_ROUTER stays breaker-managed rather than exempting the install from its own breaker

Note on numbering

0.7.99 and 0.7.100 published normally and do not contain the router work.

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