Add #[JsonProperty] attribute and runtime improvements

[thiagocordeiro]

Summary

Stacks four related improvements toward a stable v1, ending in a Jackson-style #[JsonProperty] attribute. Each commit is self-contained and reviewable on its own.

• Improve error paths and reject invalid bool input — readList/readArrayMap and RuntimeWriter now append the concrete index/key to the error path instead of a generic []. readBool switches to FILTER_NULL_ON_FAILURE and throws UnableToParseValue for unparseable input rather than silently coercing to false.
• Move RuntimeTypeNodeFactory cache to instance state — was process-wide static, now per-instance. Tests no longer leak through it.
• Share a single TypeNodeFactory across reader, writer and spec — ArrayObjectMapper/JsonObjectMapper accept an optional TypeNodeFactory and wire defaults to share it, collapsing three duplicate caches into one. defaultTypeReader/defaultTypeWriter become nullable.
• Add #[JsonProperty] attribute — pin the JSON wire name independently of the PHP identifier on both read and write paths. Error traces and the specification factory output use the wire name. New SnakeCaseDto fixture and JsonPropertyTest cover read, write, error path, and spec.

Test plan

• composer test:unit — existing suite stays green (no fixture used key, so defaults preserve current behavior)
• composer test:unit — new JsonPropertyTest passes (read, write, error path, spec)
• composer test:stan at level=max stays clean
• Manual round-trip of {"created_at": "2025-01-01"} through a class with #[JsonProperty('created_at')] DateTimeImmutable $createdAt — confirms DateTime mapper composition still works

Suite cannot run locally until tcds-io/php-better-generics is tagged with TypeParser and the generic/shape helpers under fn/functions.php.

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