Generates JSON schemas for struct-backed event types and read models.

This is the single source of truth for schema generation shared by event type registration (Chronicle.EventTypes) and read model registration (Chronicle.Registration.Coordinator). Generating both through one path keeps property typing consistent and ensures compliance (PII) metadata is always embedded the same way.

PII is resolved from two places, mirroring the C# client's PIIMetadataProvider:

• Property-level — a field marked with Chronicle.Compliance.pii/1,2 on the event type or read model module itself.
• Type-level — a field whose value is a Chronicle.Concept module that declared pii/0,1 on itself (see that module's documentation). The concept's compliance classification travels with it automatically to every event and read model that uses it, without repeating the annotation at every call site.

Nested structs (including concepts) are descended into recursively, and a Chronicle.Concept field is described by the schema of its wrapped value, not the wrapper struct — mirroring the concept's own Jason.Encoder implementation, so the schema always matches what actually goes on the wire.

Compliance metadata is always written on schema leaves, never on a container ("type" => "object") node: a marker left on a container would make Chronicle hand the whole JSON object to the PII handler and store one opaque ciphertext string where the schema still says object, so a released value comes back as a string instead of an object and the read model fails to materialize. An array is the one exception — compliance declared on the array field itself stays on the array (the collection is blob-encrypted as a whole); compliance resolved from the array's element type (a list of PII concepts) is attached to the "items" schema instead, which is already a leaf. A leaf reachable through more than one path (for example a PII concept nested inside a value object whose own field also carries a property-level pii/1,2) is only ever marked once.