U1: workflow-step sessions now carry FUSION_WORKFLOW_STEP=1 (scoped to
the step session, not the main executor) so skills detect autonomous
context and surface questions via await-input instead of a dead blocking
tool.
U8: bundle ce-commit, ce-commit-push-pr, and ce-resolve-pr-feedback
(vendored from compound-engineering 3.9.4) so the CE merge/PR flow has
its skills. Registered in COMPOUND_ENGINEERING_SKILLS; manifest test
updated.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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