Enhance documentation and add scripts for composer.json.

[terabytesoftw]

Q	A
Is bugfix?	✔️
New feature?	❌
Breaks BC?	❌
Tests pass?	❌

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 18.34%. Comparing base (151c18c) to head (0cf1672).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #549   +/-   ##
=========================================
  Coverage     18.34%   18.34%           
  Complexity      656      656           
=========================================
  Files            78       78           
  Lines          3495     3495           
=========================================
  Hits            641      641           
  Misses         2854     2854           

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[Copilot]

Pull request overview

Adds internal contributor documentation and Composer scripts to standardize local validation, while improving PHPDoc annotations to help static analysis (PHPStan) understand Yii-style magic properties.

Changes:

• Added Composer scripts for PHPCS/PHPCBF, PHPStan, and PHPUnit; documented how to run them.
• Improved PHPDoc property annotations across several panels/models to reduce PHPStan noise and improve IDE inference.
• Updated README badges/links and added a changelog entry; adjusted PHPStan baseline.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
src/panels/UserPanel.php	Adds PHPDoc for $user magic property.
src/panels/TimelinePanel.php	Adds PHPDoc for $memory and $svg magic properties.
src/panels/DbPanel.php	Adds PHPDoc for several properties (but introduces a type/documentation conflict for $db).
src/models/UserSwitch.php	Adds PHPDoc for magic properties (but mainUser nullability is incorrect).
src/Panel.php	Documents $error property with getter/setter type difference.
src/Module.php	Documents debugHeaders setter-style property.
phpstan-baseline.neon	Removes some suppressions and adds new ones (some are avoidable by fixing source PHPDoc).
docs/internals.md	New internal doc describing how to run validation via Composer scripts.
composer.json	Adds Composer scripts (but static currently won’t run PHPStan correctly).
README.md	Updates badges and adds Internals link (Twitter badge URL has a query-string issue).
CHANGELOG.md	Adds entry for bug #549.

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