Update client

[herber]

Note

Medium Risk
Large client-surface expansion plus several breaking type/constructor renames (notably file links) and request/param schema changes that could impact existing consumers at compile time or via changed JSON payloads.

Overview
Expands the Go client’s v1 API coverage by adding new endpoints for agents (and agents/{id}/instances), assistants, conversations (and conversations/{id}/messages), documents (CRUD + clone, plus participants, versions, and permissions), and a full set of integrations endpoints (integrations, providers, instances, instance-groups, setup-sessions, and provider materialization Set).

Adds management-scoped equivalents for most of the above under v1/endpoints/management, routing requests through instances/{instanceId}/....

Updates and reshapes existing APIs: adds Get for callback instances, expands list filtering for files/sessions/provider configs/auth-configs, renames and retargets file-link support from FileLinksEndpoint/resources/filelinks to FilesLinksEndpoint/resources/files/links, and adjusts Magic MCP request bodies and provider management (new fields/filters and reordered Get/Create semantics).

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