3.1.0

• parseText() returns early on empty/whitespace input with a warning log
• Template variable names validated as valid PCRE group identifiers; new InvalidTemplateVariableNameException is thrown on failure
• Prepared regex validated before return; new InvalidTemplateSyntaxException with PCRE error message is thrown on failure
• In-memory template cache in TemplatesHelper to avoid redundant disk reads on repeated parseText() calls
• ParseResult implements \IteratorAggregate + \Countable for native foreach and count()
• ParseResult::getOrFail(): A strict accessor with non-nullable string return type was added
• All log messages enriched with file path, byte size, template count, similarity flag, key count for easier debugging
• PHPStan level-8 added as a dev tool