fix: correct Node.js version in README and increase mermaid test timeout

[pilat]

README stated Node.js 20+ as the requirement, but the project actually requires Node 22+ — the engines field in package.json enforces >=22.0.0 and Node 20 reached EOL in April 2026. The Quick Start section now reflects reality.

The mermaid ELK rendering tests were hitting the default 5s timeout on slower machines — the first render of a nested subgraph diagram alone can take over 5s due to ELK layout computation. Raised the per-describe timeout to 15s for the mermaid suite.

Summary by CodeRabbit

• Documentation

  • Updated the documented minimum Node.js requirement to version 22 or later.

• Tests

  • Improved the reliability of Mermaid ELK rendering validation by allowing additional time for rendering-related checks. Existing rendering, hashing, filename, and regression coverage remains unchanged.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 83ef9fff-43d9-44dd-806e-2ea11ed2c6d8

📥 Commits

Reviewing files that changed from the base of the PR and between 5d371f9 and bed1cac.

📒 Files selected for processing (2)

• README.md
• test/mermaid-elk.test.ts

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📝 Walkthrough

Walkthrough

The README now requires Node.js 22 or newer. The Mermaid ELK rendering test suite now has a 15-second timeout.

Changes

Runtime requirement

Layer / File(s)	Summary
Document Node.js 22 requirement README.md	The documented minimum Node.js version changes from 20 to 22.

Mermaid ELK test timeout

Layer / File(s)	Summary
Increase Mermaid ELK test timeout test/mermaid-elk.test.ts	The test suite timeout increases to 15 seconds.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Possibly related PRs

• pilat/markfluence#7: Updates the project’s minimum Node.js requirement from 20 to 22.
• pilat/markfluence#8: Updates the documented minimum Node.js version to 22.

🚥 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 summarizes both changes: the Node.js requirement update and the Mermaid ELK test timeout increase.
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.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/readme-node-version-and-test-timeout

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