chore(remark-lint): improve for node core

[avivkeller]

Improves the remark-lint package by:

• Fixing an issue with type validation where it would include comments, code blocks, etc
• Adding link validation, as mentioned by @aduh95

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Project	Deployment	Actions	Updated (UTC)
nodejs-org	Ready	Preview	Jul 21, 2026 3:39am

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PR Summary

Medium Risk
Enabling link validation in the default preset may introduce new lint failures across docs; the type-reference change is a false-positive fix with low regression risk.

Overview
Bumps @node-core/remark-lint to 1.4.0 and wires remark-validate-links into the default preset so markdown lint can flag broken local heading links (e.g. missing-heading).

The node-core:invalid-type-reference rule no longer scans every AST node by raw value; it only runs on text and html nodes that match the type-reference pattern, so {…} in HTML comments, inline code, fenced blocks, and raw HTML are ignored. Tests cover that case, and the rule test helper now returns the parsed tree for optional assertions.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.83%. Comparing base (7dac7d8) to head (ee06ec6).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9016      +/-   ##
==========================================
+ Coverage   74.57%   74.83%   +0.26%     
==========================================
  Files         100      101       +1     
  Lines        8803     8891      +88     
  Branches      324      329       +5     
==========================================
+ Hits         6565     6654      +89     
+ Misses       2234     2233       -1     
  Partials        4        4              

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[github-actions]

📦 Build Size Comparison

Summary

Metric	Value
Old Total First Load JS	10.64 MB
New Total First Load JS	10.64 MB
Delta	0 B (0.00%)