[Refactor] Re-export History from tensordict.llm

[vmoens]

Description

History, ContentBase, add_chat_template and the base chat templates moved to tensordict.llm (pytorch/tensordict#1724), which is now their canonical home. This PR turns torchrl/data/llm/history.py into a backward-compatibility shim that re-exports the public symbols plus the private template registries (_CHAT_TEMPLATES, _CUSTOM_INVERSE_PARSERS, _CUSTOM_MODEL_FAMILY_KEYWORDS) and mask helpers, so:

• all existing torchrl.data.llm.history / torchrl.data.llm / torchrl.data import paths keep working;
• class identity is shared (torchrl.data.llm.History is tensordict.llm.History);
• template registry mutations are visible through both paths.

History.default_spec() keeps working unchanged: the tensordict implementation lazily imports the Composite/NonTensor specs from torchrl.

No deprecation warning is emitted for now — the path has many internal callers; new code should import from tensordict.llm directly.

Dependencies

Draft until pytorch/tensordict#1724 merges and is available in the tensordict build used by CI. At release time the tensordict floor in pyproject.toml should be bumped to the first version that ships tensordict.llm.

Tests

test/llm/test_data.py::TestHistory exercises the shim unchanged; verified locally that the import paths resolve to the tensordict classes and the History construction/completion/template tests pass.

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[pytorch-bot]

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❌ 41 New Failures, 15 Unclassified Failures

As of commit 5021c1c with merge base 393042c ():

NEW FAILURES - The following jobs have failed:

• Build Aarch64 Linux Wheels / pytorch/rl (pytorch/rl, test/smoke_test.py, torchrl, .github/scripts/pre-build-script.sh) / build-wheel-py3_10-cpu-aarch64 (gh)
  ModuleNotFoundError: No module named 'tensordict.llm'
• Build Aarch64 Linux Wheels / pytorch/rl (pytorch/rl, test/smoke_test.py, torchrl, .github/scripts/pre-build-script.sh) / upload / upload-wheel-py3_10-cpu-aarch64 (gh)
  Unable to download artifact(s): Artifact not found for name: pytorch_rl__3.10_cpu_aarch64
• Build Linux Wheels / pytorch/rl (pytorch/rl, test/smoke_test.py, torchrl, .github/scripts/pre-build-script.sh) / build-manywheel-py3_10-cpu (gh)
  ModuleNotFoundError: No module named 'tensordict.llm'
• Build Linux Wheels / pytorch/rl (pytorch/rl, test/smoke_test.py, torchrl, .github/scripts/pre-build-script.sh) / build-manywheel-py3_10-cuda12_6 (gh)
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• Build Linux Wheels / pytorch/rl (pytorch/rl, test/smoke_test.py, torchrl, .github/scripts/pre-build-script.sh) / build-manywheel-py3_10-cuda13_0 (gh)
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• Build Linux Wheels / pytorch/rl (pytorch/rl, test/smoke_test.py, torchrl, .github/scripts/pre-build-script.sh) / build-manywheel-py3_10-cuda13_2 (gh)
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• Build Linux Wheels / pytorch/rl (pytorch/rl, test/smoke_test.py, torchrl, .github/scripts/pre-build-script.sh) / upload / upload-manywheel-py3_10-cpu (gh)
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• Build Linux Wheels / pytorch/rl (pytorch/rl, test/smoke_test.py, torchrl, .github/scripts/pre-build-script.sh) / upload / upload-manywheel-py3_10-cuda12_6 (gh)
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• Build Linux Wheels / pytorch/rl (pytorch/rl, test/smoke_test.py, torchrl, .github/scripts/pre-build-script.sh) / upload / upload-manywheel-py3_10-cuda13_2 (gh)
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• Build M1 Wheels / pytorch/rl / build-wheel-py3_10-cpu (gh)
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• Build M1 Wheels / pytorch/rl / upload / upload-wheel-py3_10-cpu (gh)
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• Build Windows Wheels / pytorch/rl / build-wheel-py3_10-cpu (gh)
• Build Windows Wheels / pytorch/rl / upload / upload-wheel-py3_10-cpu (gh)
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• Continuous Benchmark (PR) / CPU Pytest benchmark (gh)
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• Generate documentation / build-docs (3.12, 12.8) / linux-job (gh)
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• Libs Tests on Linux / unittests-gym (3.10, 12.8) / linux-job (gh)
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• Unit-tests on Linux / tests-cpu (3.12) / linux-job (gh)
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• Unit-tests on Linux / tests-gpu (3.12, 13.0, 2) / linux-job (gh)
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• Unit-tests on Linux / tests-gpu-distributed (3.12, 13.0) / linux-job (gh)
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• Unit-tests on Linux / tests-olddeps (3.10, 11.8) / linux-job (gh)
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• Unit-tests on Linux / tests-optdeps (3.12, 13.0) / linux-job (gh)
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• Unit-tests on Linux / tests-stable-gpu (3.12, 13.0, 1) / linux-job (gh)
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• Unit-tests on Linux / tests-stable-gpu (3.12, 13.0, 2) / linux-job (gh)
  RuntimeError: Command docker exec -t 704c24790a375434948238b398aed951268505b46eaf0dc6832b9c3a1f48546e /exec failed with exit code 2
• Unit-tests on Linux / tests-stable-gpu (3.12, 13.0, 3) / linux-job (gh)
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• Unit-tests on Linux / tests-stable-gpu-distributed (3.12, 13.0) / linux-job (gh)
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• Unit-tests on Linux / upload-codecov (gh)
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• Unit-tests on Windows / unittests-cpu (3.10, windows.4xlarge, cpu) / windows-job (gh)
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• Validate Test Partitioning / validate (gh)
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UNCLASSIFIED FAILURES - DrCI could not classify the following jobs because the workflow did not run on the merge base. The failures may be pre-existing on trunk or introduced by this PR:

• Push Binary Nightly / test-wheel-unix (linux, ubuntu-22.04, 3.10, cp310-cp310, cpu, cpu) (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
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• Push Binary Nightly / test-wheel-unix (linux, ubuntu-22.04, 3.11, cp311-cp311, cpu, cpu) (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
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• Push Binary Nightly / test-wheel-unix (linux, ubuntu-22.04, 3.12, cp312-cp312, cpu, cpu) (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
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• Push Binary Nightly / test-wheel-unix (linux, ubuntu-22.04, 3.13, cp313-cp313, cpu, cpu) (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
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• Push Binary Nightly / test-wheel-unix (linux, ubuntu-22.04, 3.14, cp314-cp314, cpu, cpu) (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
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• Push Binary Nightly / test-wheel-unix (macos, macos-latest, 3.10, cp310-cp310, cpu, cpu) (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  ModuleNotFoundError: No module named 'tensordict.llm'
• Push Binary Nightly / test-wheel-unix (macos, macos-latest, 3.11, cp311-cp311, cpu, cpu) (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  ModuleNotFoundError: No module named 'tensordict.llm'
• Push Binary Nightly / test-wheel-unix (macos, macos-latest, 3.12, cp312-cp312, cpu, cpu) (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
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• Push Binary Nightly / test-wheel-unix (macos, macos-latest, 3.13, cp313-cp313, cpu, cpu) (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  ModuleNotFoundError: No module named 'tensordict.llm'
• Push Binary Nightly / test-wheel-unix (macos, macos-latest, 3.14, cp314-cp314, cpu, cpu) (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
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• Push Binary Nightly / test-wheel-windows (3.10, 3.10.3) (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
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• Push Binary Nightly / test-wheel-windows (3.11, 3.11) (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
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• Push Binary Nightly / test-wheel-windows (3.12, 3.12) (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
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• Push Binary Nightly / test-wheel-windows (3.13, 3.13) (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
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• Push Binary Nightly / test-wheel-windows (3.14, 3.14) (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
  ModuleNotFoundError: No module named 'tensordict.llm'

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