[magnusp]

Why

A JdbcType describes a declared type, and a declared type has no storage class. The record carried one anyway, and nothing read it: the runtime storage class belongs to a Value, and the live path is JdbcTypeMapping.storageClass(Value).

What changed

• Removed the storage component from JdbcTypeMapping.JdbcType.
• Dropped the matching parameter from fallback, entry, and unsupported, and deleted the StorageClass.X argument from every call site: six fallback constants and the registry rows (31 entry, 5 unsupported).
• Kept StorageClass and storageClass(Value), still used by LibsqlResultSetMetaData and the fallback switch.

Blast radius

None at runtime. JdbcType is package-private and only JdbcTypeMapping constructs it, so there is no public surface change and no test change. Type resolution, metadata, and getObject read the same fields.

Verification

• git grep -n '\.storage()' -- libsql-jdbc returns nothing.
• ./mvnw clean verify: 1511 JDBC unit tests (1546 unit tests across the reactor), 192 itests, 271 conformance tests with 7 skipped, 0 failures.
• ./mvnw spotless:check passes.

Fixes #249