fix(ci): update nightly Neovim asset name

[pablopunk]

Summary

The nightly Neovim release renamed the Linux x86_64 asset from nvim-linux64.tar.gz to nvim-linux-x86_64.tar.gz, causing all CI workflows to fail with HTTP 404.

Fix

Updated asset name in all 3 CI workflows: test.yml, lazy.yml, docs.yml. v0.9.0 still uses old naming and works fine.

Prepared with the help of Codex (AI).

Summary by CodeRabbit

• Documentation
  • Clarified help text for an autocmd fallback when a buffer-modified event is unavailable in older or development builds.
• Chores
  • Updated nightly Linux download references in documentation, lazy-loading, and CI workflows to use the newer Neovim archive format.

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 4b66c09b-c308-435d-89de-a7fb03103d66

📥 Commits

Reviewing files that changed from the base of the PR and between a531ee7 and dd33128.

📒 Files selected for processing (4)

• .github/workflows/docs.yml
• .github/workflows/lazy.yml
• .github/workflows/test.yml
• doc/unclutter.txt

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Walkthrough

Three GitHub Actions workflow files (docs.yml, lazy.yml, test.yml) are updated to replace the Neovim nightly download artifact name from nvim-linux64.tar.gz to nvim-linux-x86_64.tar.gz in their respective matrix configurations. Additionally, the doc/unclutter.txt help file is updated to document that autocmds.on_buf_modified_set silently falls back when the BufModifiedSet event is unavailable in older or dev Neovim builds.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main change: updating the nightly Neovim CI asset name used by the workflows.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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