ci: Update language test workflows to Node 18.x

[data-coasys]

Summary

Updates the Node.js version in language test workflows from 16.x to 18.x.

Problem

All language test workflows have been failing since ~December 2025 with:

ERROR: This version of pnpm requires at least Node.js v18.12

pnpm 9.x dropped support for Node 16.x.

Changes

Updated node-version: [16.x] → node-version: [18.x] in:

• .github/workflows/agent-language-tests.yml
• .github/workflows/direct-message-language-tests.yml
• .github/workflows/file-storage-language-tests.yml
• .github/workflows/p-diff-sync-tests.yml

Testing

This should restore language test coverage that has been missing for 2+ months.

Summary by CodeRabbit

• Chores

  • Upgraded Node.js runtime in continuous integration workflows from 16.x to 22.x to align CI with newer runtime and improve build compatibility.

• Documentation

  • Added a documentation domain alias to simplify access to the project docs.

[coderabbitai]

📝 Walkthrough

Walkthrough

Updated multiple GitHub Actions workflows to use Node.js 22.x (previously 16.x) in CI matrices and added a docs/CNAME file with the documentation domain docs.ad4m.dev. No runtime logic, API, or workflow control-flow changes.

Changes

Cohort / File(s)	Summary
GitHub Actions — agent tests .github/workflows/agent-language-tests.yml	Node.js matrix entry changed from 16.x to 22.x. No other workflow changes.
GitHub Actions — direct message tests .github/workflows/direct-message-language-tests.yml	Node.js matrix entry changed from 16.x to 22.x. No other workflow changes.
GitHub Actions — file storage tests .github/workflows/file-storage-language-tests.yml	Node.js matrix entries changed from 16.x to 22.x for affected jobs. No other workflow changes.
GitHub Actions — p-diff sync tests .github/workflows/p-diff-sync-tests.yml	Node.js matrix entries changed from 16.x to 22.x across multiple jobs (unit, pull, render, revisions, signals, stress, telepresence). No other workflow changes.
Documentation docs/CNAME	New file added containing docs.ad4m.dev as the documentation domain alias.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

"I hopped through YAML and curls of code,
Pushed Node up the hill — a lighter load,
A tiny CNAME plants a flag so neat,
Docs dancing on docs.ad4m.dev — what a treat! 🐇"

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Title check	⚠️ Warning	The PR title states 'Node 18.x' but the actual changes update workflows to Node 22.x, creating a significant mismatch between the title and the implementation.	Update the PR title to accurately reflect the Node.js version being updated to, e.g., 'ci: Update language test workflows to Node 22.x'

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/language-tests-node-18

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The base branch was changed.

[coderabbitai]

Actionable comments posted: 1

🤖 Fix all issues with AI agents

In @.github/workflows/agent-language-tests.yml:
- Line 20: Update the GitHub Actions runner Node version by changing the
node-version entry from [18.x] to a supported LTS (recommended [22.x]) so the
workflow uses a currently supported Node release; specifically edit the
node-version key in the agent-language-tests workflow and replace its value
(node-version: [18.x]) with node-version: [22.x] (or another supported LTS like
20.x/24.x) to satisfy pnpm >=18.12 and avoid EOL runtimes.

🧹 Nitpick comments (3)

docs/CNAME (1)

1-1: Unrelated to PR scope — consider splitting.

This CNAME file for GitHub Pages is unrelated to the CI Node.js version fix described in the PR. Consider separating it into its own commit or PR to keep changes atomic and reviewable.

.github/workflows/agent-language-tests.yml (1)

26-27: Outdated GitHub Actions versions — consider bumping.

Several actions in this workflow are significantly outdated:

• actions/checkout@v2 → latest is actions/checkout@v6
• actions/setup-node@v2 → latest is actions/setup-node@v6
• actions/cache@v3 → v4 is current
• actions-rs/toolchain@v1 is archived/unmaintained

Older action versions run on deprecated Node.js runtimes internally and may produce deprecation warnings or break on future runner updates.

Also applies to: 33-33, 44-44

.github/workflows/p-diff-sync-tests.yml (1)

331-374: Consider removing the commented-out integration job.

This entire job has been commented out (and also got the 18.x update at Line 337). If it's no longer needed, removing it reduces noise. If it's expected to be re-enabled later, consider tracking it via an issue instead.