SQLite: add JsonValueReaderWriter for Half

[Copilot]

Follow-up to #37481

SqliteHalfTypeMapping had no JsonValueReaderWriter, causing any JSON mapping scenario (owned entity/primitive collection stored as JSON) to throw MissingJsonValueReaderWriter at runtime.

Changes

• SqliteJsonHalfReaderWriter (new) — SQLite-specific JsonValueReaderWriter<Half> that round-trips through float, matching SQLite's REAL storage. Follows the same pattern as SqliteJsonDecimalReaderWriter / SqliteJsonGuidReaderWriter.
• SqliteHalfTypeMapping — passes SqliteJsonHalfReaderWriter.Instance via CoreTypeMappingParameters(jsonValueReaderWriter: ...).
• SQLite functional test coverage — added Can_read_write_Half_JSON_values to JsonTypesSqliteTest to validate Half JSON round-tripping and prevent regressions.

Half has ~3.3 decimal digits of precision, well within float's ~7.2, so Half → float → JSON number → float → Half is lossless.

[Copilot]

Pull request overview

This PR addresses a gap in the SQLite provider’s JSON type-mapping support: Half values mapped into JSON (e.g., owned types / primitive collections stored as JSON) previously failed at runtime due to a missing JsonValueReaderWriter.

Changes:

• Adds SqliteJsonHalfReaderWriter, a SQLite-specific JsonValueReaderWriter<Half> that serializes/deserializes via float.
• Wires the new reader/writer into SqliteHalfTypeMapping via CoreTypeMappingParameters(jsonValueReaderWriter: ...).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
src/EFCore.Sqlite.Core/Storage/Json/Internal/SqliteJsonHalfReaderWriter.cs	Introduces a JSON reader/writer for Half using float as the intermediate representation.
src/EFCore.Sqlite.Core/Storage/Internal/SqliteHalfTypeMapping.cs	Registers the new JSON reader/writer so JSON mapping scenarios for Half no longer throw at runtime.

[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated no new comments.