[NimmLor]

PerfRun ran the Functions map, then the Microvms map. Now a MeasureAll Parallel state runs both maps as branches, and RecordRun and Summarize follow it. A run now takes as long as the slower of the two branches instead of both added together.

• MeasureAll sets output: {}, so RecordRun doesn't receive the branches' result array. RecordRun and Summarize still get runId from $states.context.Execution.StartTime, which is the same inside a Parallel branch.
• The transform that sets ToleratedFailurePercentage = 100 now finds each map inside MeasureAll's Branches instead of at the top level. A failed child still doesn't fail the run.
• MicroVMs still run one size at a time because of the 8 GB account quota. The old comment said they ran after the functions to keep load off Lambda's control plane. MicroVM rounds call RunMicrovm, CreateMicrovmAuthToken and TerminateMicrovm, not UpdateFunctionConfiguration, so they shouldn't count against the 15 requests/s quota the function rounds use. I couldn't confirm this before deploying, so check the first run's MicroVM round trips and the function rounds for throttling.
• Updated the header comment in infra/perf.ts and the README's MicroVM section.

Checks: bun run typecheck, bun lint --max-warnings 0 (canary), bun fmt --check and bun test pass. Not deployed yet.

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