[Task Clean-up] Dexterous Part 8/8: Move the warp Direct task variants to isaaclab_tasks_experimental

[hujc7]

Review Map

• Exact changes: a stacked PR's page shows the cumulative diff of its dependency chain; the link pins the commit range that is the PR's own contribution.
• Links pin specific SHAs and can go stale after a branch update — the table on [DO-NOT-MERGE][Task Clean-up] Dexterous: lumped validation branch (series reference) #6324 is refreshed first.

PR	Status	Depends on	Exact changes
#6410 [Docs] Environment overview regen		—	—
#6411 Part 1/8: Newton cloner/cubric/visualizer fixes		—	—
#6412 Part 2/8: OVPhysX articulation + manager runtime		—	—
#6413 Part 3/8: Reorient Direct, torch		—	—
#6414 Part 4/8: MARL-to-single-agent fix + handover/camera Direct		#6413	changes
#6418 Part 5/8: Reorient manager counterparts		#6413	changes
#6421 Part 6/8: Handover + camera manager counterparts		#6413, #6414, #6418	changes
#6415 Part 7/8: Benchmark success-rate utilities + docs		#6413, #6414, #6418, #6421	changes
📌 #6582 Part 8/8: Warp variants → experimental (draft; merges last) (this PR)		#6413	changes
#6324 [DO-NOT-MERGE] Lumped validation reference		ALL	—

Summary

• Moves the warp-first implementation of the Shadow reorientation and handover Direct environments (kernels, environments, kernel behavior tests) to isaaclab_tasks_experimental, following the torch-first mainline convention: torch task logic in isaaclab_tasks, warp implementations in the experimental track.
• The variants register under -Direct-Warp-v0 IDs and reuse the stable configurations and agents from isaaclab_tasks.core. The Allegro warp variant keeps its existing legacy registration in the experimental package.
• The diff is largely the review-polished warp implementation from the lumped validation branch [DO-NOT-MERGE][Task Clean-up] Dexterous: lumped validation branch (series reference) #6324, relocated with import-path updates.

Stacking

• Based on [Task Clean-up] Dexterous Part 3/8: Add success-rate metrics to the reorientation Direct tasks #6413's branch; this page shows the cumulative diff until [Task Clean-up] Dexterous Part 3/8: Add success-rate metrics to the reorientation Direct tasks #6413 merges. Merges last in the series.
• Deeper consolidation with the experimental warp track (DirectRLEnvWarp) and the performance focus for the experimental variants are follow-on scope, out of this series.

Validation

• 44/44 warp kernel behavior tests; pre-commit green. Full integrated training/validation evidence: [DO-NOT-MERGE][Task Clean-up] Dexterous: lumped validation branch (series reference) #6324.