Fix PHP 8.1+ warnings for undefined array keys in KEYWORD_SOURCE_SYNTAX case (#7)

* Initial plan

* Fix issue #6: Add null-safe checks for plugin_description metadata

Co-authored-by: mprins <116578

Fix PHP 8.1+ warnings for undefined array keys in KEYWORD_SOURCE_SYNTAX case (#7)

* Initial plan

* Fix issue #6: Add null-safe checks for plugin_description metadata

Co-authored-by: mprins <1165786+mprins@users.noreply.github.com>

* Update plugin date to December 28, 2025

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: mprins <1165786+mprins@users.noreply.github.com>

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Some refactoring, reformatting and integration tests (#4)

* Some refactoring and reformatting

* Add a syntax and a global config integration test