-COMMAND: Create BUILD_PR_LEVEL_17_21_TRACK_H_3D_DEBUG_SUPPORT_CLOSEOUT as a docs-first, repo-structured delta. Use docs/pr/PLAN_PR_LEVEL_17_21_TRACK_H_3D_DEBUG_SUPPORT_CLOSEOUT.md and docs/pr/BUILD_PR_LEVEL_17_21_TRACK_H_3D_DEBUG_SUPPORT_CLOSEOUT.md as the source of truth. Finish the remaining Transform Inspector implementation under src/engine/debug/standard/threeD using the smallest valid provider/panel/wiring/test delta, preserve the already completed camera debug panel, render pipeline stages, collision overlays, and scene graph inspector, then perform status-only conservative roadmap updates to close Track H and 3D debug support only if validated by execution evidence. Final step: package only this PR's created and modified files into <project folder>/tmp/BUILD_PR_LEVEL_17_21_TRACK_H_3D_DEBUG_SUPPORT_CLOSEOUT.zip with exact repo-relative structure.
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