feat(blog): create post for v26.5.0

[github-actions]

Creates a new blog post for v26.5.0

Check this workflow's logs at https://github.com/nodejs/nodejs.org/actions/runs/28940889443.

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Project	Deployment	Actions	Updated (UTC)
nodejs-org	Ready	Preview	Jul 8, 2026 12:01pm

[cursor]

PR Summary

Low Risk
Documentation-only addition on the site; no application or runtime code changes.

Overview
Adds the English release blog post for Node.js v26.5.0 (Current) at apps/site/pages/en/blog/release/v26.5.0.md, matching the usual release layout (blog-post, category: release, author Richard Lau).

The new page publishes the 2026-07-08 announcement: a new release signing key (Stewart X Addison), notable semver-minor items (blob.textStream(), --experimental-import-text, perf_hooks event-loop delay sampling, ReadableStreamTee, negotiated TLS groups), the full commit changelog, dist download URLs, and PGP-signed SHASUMS for verification.

^{Reviewed by Cursor Bugbot for commit a9644c4. Bugbot is set up for automated code reviews on this repo. Configure here.}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.60%. Comparing base (f2f21ac) to head (a9644c4).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9001      +/-   ##
==========================================
+ Coverage   74.59%   74.60%   +0.01%     
==========================================
  Files         100      100              
  Lines        8801     8801              
  Branches      324      324              
==========================================
+ Hits         6565     6566       +1     
+ Misses       2232     2231       -1     
  Partials        4        4              

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