[jacquard-common] add hand-written atproto XRPC types for codegen bootstrapping
Create xrpc/atproto.rs module with minimal XRPC endpoint types for:
- com.atproto.repo.listRecords
- com.atproto.repo.getRecord
- com.atproto.identity.resolveHandle
- com.atproto.identity.resolveDid
These types are vendored in jacquard-common to break circular dependencies
between jacquard-lexgen/jacquard-identity and jacquard-api. Implements
XrpcRequest/XrpcResp traits and manual IntoStatic impls (cannot use
jacquard_derive::IntoStatic due to lack of jacquard-derive dependency).
Includes 10 unit tests verifying serialization, deserialization, and
IntoStatic trait implementation for all types.