docs: show the current mobile decision flow

[abrichr]

Summary

• add the exact request, accepted-pending, and runner-result captures to the attended-decision guide
• add the same sequence to the OEM brief and Desktop install guide
• record exact Cloud #276 commit, hash, viewport, and synthetic-data provenance

Validation

• UV_CACHE_DIR=/tmp/uv-cache-openadapt-ops uv run mkdocs build --strict
• git diff --check

Depends on OpenAdaptAI/openadapt-cloud#276 for the source component and canonical capture set.