RepositoryRpc class

A tiny, transport-agnostic JSON layer over a RepositoryService.

It maps a plain {'op': <name>, ...args} request map to the matching RepositoryService method and serializes the result with the value types' existing toJson(). It is web-safe (no dart:io): a server (see tool/repository_server.dart) only has to move JSON maps in and out over HTTP, and a RemoteRepositoryAdapter on the other side speaks the exact same ops via the Op constants below — so the wire contract lives in one place.

Every call returns a normalized envelope:

• success → {'ok': true, 'result': <object>}
• a reported failure (RepoException) → {'ok': false, 'error': {'type', 'message'}}, with type = RepoPermissionException or RepoException.

Result shapes (keyed so the client deserializes unambiguously):

• scalar value types (read/stat/write/edit/capabilities/git mutations) → the value's toJson() map directly.
• list/gitStatus → {'entries': [...]}; find → {'paths': [...]}; searchText → {'matches': [...]}; gitLog → {'commits': [...]}; gitBlame → {'lines': [...]}; gitDiff/gitShow → {'text': ...}; void ops (mkdir/move/delete) → {}.