v0.5.4

The core and its optional modules are now available on Packagist. Install the
core with composer require "roukmoute/pdf:^0.5.4"; custom VCS repositories are
no longer needed in applications or in this package's development manifest.

The optional development modules are locked to their published 0.1.5
releases. Composer metadata links directly to the shared documentation, and the
README presents the public package pages and normal installation commands.

The PHP API, PHP 8.3 minimum, runtime source and original Adobe reference PDFs
are unchanged. Installing the core alone still installs no optional module.

Publication checks include the exact indexed source/distribution commits and
fresh installs using only the default Packagist repository. Package checks run
on PHP 8.3, 8.4 and 8.5, including the independent PDF validators.

See Packagist,
the shared documentation, and
the changelog.