Exponential Platform Legacy (Stable CMS) Files

Fixed

• The standard theme's page head loaded YUI, which legacy kernel 6.0.15 removed. Every front page requested the YUI 2 loader and three yui_*.css files that answer 404, and raised "YAHOO is not defined". The head now asks the kernel what it provides (exp_legacy_js_library()):
• YUI is loaded only where the kernel still ships it (6.0.14 and earlier).
• jQuery and jQuery Migrate are the files of the kernel's own ezjsc::jquery (exp_legacy_jquery_scripts()): 4.0.0 with Migrate 4.0.2 from Exponential UI on 6.0.15, and 3.7.1 on 6.0.14.
• The head no longer loads four YUI 3 modules of the legacy admin (fixed_toolbar.js, ezmodalwindow.js, ezajaxuploader.js, ezcollapsiblemenu.js). No YUI 3 was ever loaded, so on 6.0.14 they raised "YUI is not defined" four times per page.
• framework.trusted_proxies reads TRUSTED_PROXIES with string:. With default:: alone, Symfony 5.4 rejected the configuration, so every console command failed with 'Invalid type for path "framework.trusted_proxies"'. A fresh composer install therefore stopped at its first script.

Verified on a fresh 3.x install (SQLite, PHP 8.2, legacy-bridge 3.0.0.37):

• Kernel 6.0.15 (dev-main): / and /user/login answer 200 with jQuery 4.0.0, no YUI request, no HTTP error and no JS error.
• Kernel 6.0.14: the YUI files load (200) and there is no JS error.

Known, not changed here

• doc/INSTALL.md names exponential:install, but a fresh install gets se7enxweb/ezplatform-kernel 1.3.x-dev from the stale 1.3 branch, which only has ezplatform:install. se7enxweb/oss v3.3.0.4 requires ^1.3.x-dev, and Packagist maps both the 1.3 and the 1.3.x branches to that version.