Rename selective-build ROOT_OPS to SELECT_OPS_LIST

[sankalpsthakur]

Summary

• Renames the gen_selected_ops CMake keyword ROOT_OPS to SELECT_OPS_LIST to match the existing EXECUTORCH_SELECT_OPS_LIST cache option.
• Renames the matching gen_oplist CLI/API from --root_ops / root_ops to --select_ops_list / select_ops_list.
• Updates call sites, docs, Buck shim, Zephyr samples, and unit test names accordingly.
• Clean rename (no deprecation alias): the codebase does not already pattern cmake-option deprecation for this path.

Notes

• Pre-existing: gen_oplist.py still prints the ops list to stdout (was print(root_ops)); left untouched to keep this PR rename-only.

Validation

• Repo-wide search confirms no remaining ROOT_OPS / --root_ops / root_ops references outside third-party.
• ast.parse syntax check on codegen/tools/gen_oplist.py and codegen/tools/test/test_gen_oplist.py.
• Full pytest for test_gen_oplist.py not run locally (requires ExecuTorch/torch install).

Fixes #12133

AI/LLM disclosure

• AI coding tools (including Grok and/or Codex agent-assisted editing) were used to help draft or modify code and this PR description.
• I reviewed the complete change, understand the reasoning, and ran the reported local checks before submitting.
• This submission is original work of authorship under the project CLA / contributor terms; AI output was not pasted unreviewed.

CLA

• Meta CLA: https://code.facebook.com/cla — currently unsigned / action required on this PR (Meta CLA Check + EasyCLA both failing). Sign at that URL, then I can re-trigger with an empty commit on the fork if needed.

cc @mergennachin @nil-is-all @digantdesai @freddan80 @per @zingo @oscarandersson8218 @mansnils @Sebastian-Larsson @robell @rascani

[pytorch-bot]

🔗 Helpful Links

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⚠️ 18 Awaiting Approval

As of commit 995c835 with merge base c7b6f52 ():

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[nil-is-all]

Hi @sankalpsthakur, thanks for putting up the fix! While we review this PR, please do sign the CLA agreements in order to approve & merge contributions in this repository.

[sankalpsthakur]

Thanks @nil-is-all — Meta CLA is signed (check green). EasyCLA is still showing unauthorized; I’m sorting that and pushed a lintrunner format fix for the SELECT_OPS_LIST call sites.