List tables in the agent's workspace

The fallback discovery surface in v2. The run object only carries response.tables[] for tables a specific run touched (empty when the run made no mutations or stopped on a question), so callers that need "every table this agent has access to" use this endpoint instead.

Each entry is a full TableObject — same shape as GET /api/v2/tables/{id} and the same shape embedded under Run.response.tables[]. Pass ?include=stats to attach the economics block (per-table + per-column).

Scoped to the agent's own workspace; a caller cannot probe arbitrary workspaces through this path. Returned in the canonical list envelope with nextCursor always null — an agent's workspace is rarely more than a handful of tables, so the endpoint does not paginate.