feat: add addon sunrise file loader

[superdav42]

Summary

Adds load_addon_sunrise_files() to Sunrise::init() that auto-discovers and loads sunrise.php files from Ultimate Multisite addon plugins.

Why

Addons like multi-tenancy need to run code at sunrise time (before ms-settings.php resolves the network) to override $current_site for customer networks. Previously this required manually editing the root sunrise.php, which Ultimate Multisite may overwrite on update.

How

• New protected static function load_addon_sunrise_files() in Sunrise class
• Scans WP_PLUGIN_DIR/ultimate-multisite-*/sunrise.php via glob()
• Includes matches in alphabetical order after domain mapping, before ms_loaded
• No-op when no addon sunrise files exist

Testing

1. Install ultimate-multisite-multi-tenancy with its new sunrise.php
2. Create a customer network with isolated DB
3. Verify customer domain loads from customer DB (not host)
4. Verify host domain still loads normally

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 91130ca1-99f5-4627-9e0f-ed5e28d7dcc9

📥 Commits

Reviewing files that changed from the base of the PR and between 9911f4b and 4cef9ba.

📒 Files selected for processing (1)

• inc/class-sunrise.php

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/addon-sunrise-loader

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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

[github-actions]

Performance Test Results

Performance test results for 9ebfd21 are in 🛎️!

Note: the numbers in parentheses show the difference to the previous (baseline) test run. Differences below 2% or 0.5 in absolute values are not shown.

URL: /

Run	DB Queries	Memory	Before Template	Template	WP Total	LCP	TTFB	LCP - TTFB
0	40	37.80 MB	881.00 ms (+53.50 ms / +6% )	163.50 ms	1087.50 ms (+37.50 ms / +3% )	2110.00 ms (+46.00 ms / +2% )	2023.60 ms (+51.05 ms / +3% )	87.50 ms (-5.30 ms / -6% )
1	56	49.03 MB	950.00 ms	149.00 ms	1100.50 ms	2110.00 ms	2024.35 ms	81.20 ms