merge: adopt remote main history, V8.10.0-dev.1 tree supersedes V5 baseline
Remote main carried a V5 source baseline plus COMPLETION_PLAN.md (v1.0/v2.0). Our tree is the V8.10.0-dev.1 continuation of that same lineage; the plan document is preserved. Their commits stay reachable, our tree wins wholesale. Co-Authored-By: Claude Code <noreply@anthropic.com>
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