docs: record Stage 1 calibration and swift-syntax scouting results

Real MutantBench Stage 1 Calibration run (swift-numerics, GCD.swift,
RelationalOperatorReplacement only) and swift-syntax scouting run
(AbsolutePosition.swift, same operator), both run on this public
repo's own free macOS Actions minutes since the maintainer's private
repo billing is still unavailable (see #70 tracked upstream).

Both correctness gates passed: 0 phantoms, 0 false-scored, 0 backend
disagreements. This is calibration/wiring evidence (1 repetition per
mode), not a performance conclusion — cross-tool mutant matching
found 0 exactly-comparable mutants in either project, so no speed
comparison is drawn from these numbers.

Run: https://github.com/juntaki/mutantkit/actions/runs/31090686349

Author: juntaki

Benchmarks/results-scout-swift-syntax/compatibility/Developer/aggregate.json

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