v0.5.0

• BC: one unknown-key mode per object, the new Unknown enum
  (Reject — the default, unchanged — Strip, Passthrough), set by
  Schema::object([...], unknown: Unknown::Strip) or ->unknown(...).
  Replaces the bool $additionalProperties factory argument, the
  additionalProperties() and strip() methods and the
  $additionalProperties/$strip properties. Migration:
  additionalProperties: true / ->additionalProperties() →
  unknown: Unknown::Passthrough; ->strip() → unknown: Unknown::Strip.
  Parse, export and wire behaviour of each mode is unchanged.
• BC: SchemaInterface::parseJson(string $json): decode + parse, invalid
  JSON is a root error Invalid JSON (…) instead of a misleading type error
  about null. Custom SchemaInterface implementations must add it
  (SchemaType subclasses inherit it).
• Behavior change: int/float bound messages no longer echo the
  input (Int must be at least 18, was …, got 17) — the package's own
  rule that messages carry kinds and sizes, never values. Lengths and
  counts stay in the messages.
• Fix: numeric property names ('0', which PHP stores as int 0) work
  everywhere — arbitrary() no longer dies with a TypeError, error
  segments stay strings ($.0, not $[0]).
• ParseResult::orThrow() (the value or a SchemaException) and
  ParseResult::summary(int $limit = 3, string $separator = '; ') — the
  one-line $.path message; … (+N more) consumers kept re-implementing.
  ParseError is Stringable ($.path message).
• Schema::literals([...]) → Type\LiteralsSchema: one of a fixed set of
  constants, strict ===, export enum — the value set without a PHP enum.
• ObjectSchema composition: extend(), pick(), omit(), partial();
  the unknown-key mode survives every step.
• ObjectSchema::requireAnyOf(...): at least one of the named properties
  must be present (a default counts); groups accumulate; the generator
  satisfies them constructively; export anyOf/allOf of required.
• ObjectSchema is generic (ObjectSchema<TShape>), and the package ships a
  Psalm plugin, Rasuvaeff\Schema\Psalm\Plugin: Schema::object([...])
  infers the exact array{...} shape (optional keys name?:, passthrough
  objects open), carried through extend/pick/omit/partial/unknown.
  vimeo/psalm is a suggested dependency.
• yiisoft/validator bridge: Bridge\YiiValidator\SchemaRule +
  SchemaRuleHandler — a schema as a validator rule, errors at their own
  paths (payload.items.1.sku). yiisoft/validator is a suggested
  dependency.
• README: unknown-key modes, composition, the Psalm plugin, the
  "an event is one schema" recipe (into() + toWire(); parse() is the
  inverse, no separate fromWire()), the validator bridge and the 1.x
  stability contract. Three new runnable examples; queue-payload.php
  checks parity through the wire form (a dateTime generates
  DateTimeImmutable, so the direct parse it printed was false).
• Internal docs: AGENTS.md no longer calls JSON Schema export "planned for
  1.1".