Bump plugin.json, package.json, package-lock.json, and the README badge
to 5.6.0; prepend CHANGELOG v5.6.0 entry + README "What's new" block for
the S38 loop-hardening work (machine-verifiable completion gate, bounded
recovery cap hierarchy + global budget, iterations_remaining signal,
fan-out hedge harmonization).
Additive — no breaking change. Canonical node --test stays 756 (0 fail);
version-consistency test green across all five version refs.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>