Add linearize fallback for reverse sync and workflow guide (v1.3)
When josh-proxy rejects a reverse sync push due to unmappable merge commits, fall back to linearizing: cherry-pick regular commits individually, squash only the merge commits via cherry-pick -m 1. Also adds a recommended Git workflow section to the guide explaining where cross-branch merges should happen (monorepo) vs feature work (subrepo), and expands troubleshooting for the "josh rejected push" error with root cause analysis and prevention advice. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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