feat(php-shim): implement two-argument json_decode

Was a todo!() that panicked for every command reading composer.json
(validate, status, show, update, ...). Parses via serde_json (built with
preserve_order, so insertion order is kept) and converts to PhpMixed.
Mirrors PHP's flagless json_decode: returns null rather than erroring on
malformed input, and decodes objects to ArrayObject when assoc is false,
to an associative array when true. Out-of-i64 and fractional numbers
become floats, matching PHP's default non-bigint behaviour.

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

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