GH#1840: Prepare Ultimate Multisite v2.16.0 release

[superdav42]

Summary

• Prepare Ultimate Multisite v2.16.0 release metadata and the WordPress readme changelog.
• Align the plugin header, runtime constants, package metadata, and VERSION file.
• Track the Playground preview documentation update in Docs update: Ultimate Multisite v2.16.0 docs#187.

Verification

• vendor/bin/phpcs ultimate-multisite.php inc/class-wp-ultimo.php
• PHPStan run by the pre-commit hook
• php -l ultimate-multisite.php
• php -l inc/class-wp-ultimo.php
• package.json parsed successfully

Resolves #1840

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aidevops.sh v3.32.317 plugin for OpenCode v1.18.30 with gpt-5.6-terra spent 20m and 238,897 tokens on this with the user in an interactive session.

Summary by CodeRabbit

• Release

  • Updated the plugin to version 2.16.0.

• Bug Fixes

  • Improved checkout plan labels, keyboard selection, existing-user login, and payment gateway guidance.
  • Corrected Stripe subscription invoice references and SSO authentication behavior.
  • Fixed network upgrades, setup wizard branding, error reporting, manual payment periods, and lifetime membership expiration.

• Improvements

  • Added a WordPress.org Playground live preview.
  • Improved translation handling and release quality checks.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: b395cc36-3e4d-46ea-a0b4-961381af5c8c

📥 Commits

Reviewing files that changed from the base of the PR and between af395ac and 15ac20c.

📒 Files selected for processing (5)

• VERSION
• inc/class-wp-ultimo.php
• package.json
• readme.txt
• ultimate-multisite.php

Included review availability: Your plan provides up to 2 included reviews per hour; 1 remains after this review.

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📝 Walkthrough

Walkthrough

The release metadata was updated from 2.15.2 to 2.16.0 across project, package, plugin, runtime, and documentation files. The readme now includes the 2.16.0 changelog entry.

Changes

Release metadata

Layer / File(s)	Summary
Align release versions VERSION, package.json, inc/class-wp-ultimo.php, ultimate-multisite.php, readme.txt	All release version locations were updated to 2.16.0. The readme stable tag and 2.16.0 changelog entry were added.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to 15ac2

This change aligns the 2.16.0 release metadata and changelog across the plugin’s published and runtime version locations. No current merge-blocking risk is identified.

🚥 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 identifies the release-preparation change and specifies version 2.16.0. It matches the primary purpose of the pull request.
Linked Issues check	✅ Passed	The pull request updates the documented release metadata in readme.txt, ultimate-multisite.php, inc/class-wp-ultimo.php, package.json, and VERSION for version 2.16.0. These changes match issue #1840 a…
Out of Scope Changes check	✅ Passed	All reported changes support the v2.16.0 release preparation described in issue #1840. No unrelated code or documentation changes are present.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 2…

✨ 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 release/wp-release

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[github-actions]

🔨 Build Complete - Ready for Testing!

📦 Download Build Artifact (Recommended)

Download the zip build, upload to WordPress and test:

• Build: ultimate-multisite
• ⬇️ Download from GitHub Actions
• ⬇️ Download without Github Account (nightly.link)

🌐 Test in WordPress Playground (Very Experimental)

Click the link below to instantly test this PR in your browser - no installation needed!
Playground support for multisite is very limitied, hopefully it will get better in the future.

🚀 Launch in Playground

Login credentials: admin / password