[no-ci] ci: initialize CCCL for rendered Lychee checks

[rwgk]

Description

The rendered Lychee job fails before checking links because its Pixi documentation environment builds cuda-core from source without the CCCL submodule introduced in #2940. The first cache-warming run on main exposed this in the failed rendered job.

Initialize the pinned submodule during checkout for the rendered matrix job. The authored-documentation job does not build cuda-core and keeps its existing checkout behavior. This is a focused follow-up to #2993 and #2652.

Validation on 183bd07:

• pre-commit run --all-files passed locally, including Lychee and actionlint.
• Linux and Windows pre-commit checks passed.
• Manual Lychee workflow with refresh-cache=true passed. The rendered job initialized CCCL and built the documentation successfully. Both authored and rendered link checks passed on their first attempt and published their branch caches.

After merging, dispatch a fresh lychee.yml run on main with refresh-cache=true to publish the shared rendered cache. Branch validation publishes a cache scoped to the PR branch.

Checklist

• New or existing tests cover these changes.
• The documentation is up to date with these changes.

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

• Configuration used: Repository: NVIDIA/cuda-python/.coderabbit.yaml
• Review profile: CHILL
• Plan: Enterprise
• Run ID: 9a4d9b1b-6e3e-4f76-8531-9734adaa2cef

📥 Commits

Reviewing files that changed from the base of the PR and between 4e085e1 and 183bd07.

📒 Files selected for processing: 1

• .github/workflows/lychee.yml

Included review availability: This review used your included allowance. Your plan provides up to 12 included reviews per hour; 11 remain after this review.

📝 Summary

Summary by CodeRabbit

• Chores
  • Rendered link checks now fetch submodules during checkout.

The Lychee workflow now fetches submodules for rendered documentation jobs and omits them for authored jobs.

Changes: Lychee workflow checkout

Layer / File(s)	Summary
Conditional submodule checkout .github/workflows/lychee.yml	The checkout step fetches submodules when matrix.kind is rendered. It does not fetch submodules when matrix.kind is authored.

Priority: ⬇️ Low

Change: Bug fix

Merge Risk: ⚪ Minimal · up to 183bd

The change limits submodule checkout to rendered documentation jobs. No actionable merge-blocking risk remains in the supplied review.

- [ ] Autofix · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

_{Comment @coderabbitai help to get the list of available commands.}

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

• Configuration used: Repository: NVIDIA/cuda-python/.coderabbit.yaml
• Review profile: CHILL
• Plan: Enterprise
• Run ID: 9a4d9b1b-6e3e-4f76-8531-9734adaa2cef

📥 Commits

Reviewing files that changed from the base of the PR and between 4e085e1 and 183bd07.

📒 Files selected for processing: 1

• .github/workflows/lychee.yml

Included review availability: This review used your included allowance. Your plan provides up to 12 included reviews per hour; 11 remain after this review.

📝 Summary

Summary by CodeRabbit

• Chores
  • Rendered link checks now fetch submodules during checkout.

The Lychee workflow now fetches submodules for rendered documentation jobs and omits them for authored jobs.

Changes: Lychee workflow checkout

Layer / File(s)	Summary
Conditional submodule checkout .github/workflows/lychee.yml	The checkout step fetches submodules when matrix.kind is rendered. It does not fetch submodules when matrix.kind is authored.

Priority: ⬇️ Low

Change: Bug fix

Merge Risk: ⚪ Minimal · up to 183bd

The change limits submodule checkout to rendered documentation jobs. No actionable merge-blocking risk remains in the supplied review.

- [ ] Autofix · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

_{Comment @coderabbitai help to get the list of available commands.}

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

• Configuration used: Repository: NVIDIA/cuda-python/.coderabbit.yaml
• Review profile: CHILL
• Plan: Enterprise
• Run ID: 9a4d9b1b-6e3e-4f76-8531-9734adaa2cef

📥 Commits

Reviewing files that changed from the base of the PR and between 4e085e1 and 183bd07.

📒 Files selected for processing: 1

• .github/workflows/lychee.yml

Included review availability: This review used your included allowance. Your plan provides up to 12 included reviews per hour; 11 remain after this review.

📝 Summary

Summary by CodeRabbit

• Chores
  • Rendered link checks now fetch submodules during checkout.

The Lychee workflow now fetches submodules for rendered documentation jobs and omits them for authored jobs.

Changes: Lychee workflow checkout

Layer / File(s)	Summary
Conditional submodule checkout .github/workflows/lychee.yml	The checkout step fetches submodules when matrix.kind is rendered. It does not fetch submodules when matrix.kind is authored.

Priority: ⬇️ Low

Change: Bug fix

Merge Risk: ⚪ Minimal · up to 183bd

The change limits submodule checkout to rendered documentation jobs. No actionable merge-blocking risk remains in the supplied review.

- [ ] Autofix · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

_{Comment @coderabbitai help to get the list of available commands.}