refactor(pcre): treat regex compile failure as fatal in shim

The preg_* shim helpers wrapped their results in Option/Result solely to
signal a regex that failed to compile. Composer never feeds a pattern
that fails at runtime, so such a failure is a programming error: panic
instead and drop the Option/Result wrappers, updating all callers.

preg_replace_callback keeps its Result return type since the callback
itself is fallible. preg_match_groups is removed in favor of preg_match
at its sole call site.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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