chore(sdk): sync generated SDK (v1.0.8) - #198

Note

Medium Risk
Adds client APIs for reading and writing files on session pods and new event/tool-output fields; misuse or path handling on the server side is the main concern, but the SDK change is additive.

Overview
Syncs the Python SDK to v1.0.8 with upstream OpenAPI changes from agent_platform.

Session pod files: Adds client.session_files with list_files, read_file, and write_file against the new v2 session file endpoints (allowlisted paths, size limits, base64 payloads). Exports the related types (FileEntry, ListFilesResponse, ReadFileResponse, WriteFileResponse, etc.).

Events and trajectories: Introduces FileTransferEvent on the session event stream. Tool results can now carry truncated and output_artifact_path when inline output is omitted but retained in the sandbox.

Environments: Web/browser specs gain optional lazy (provision on first agent use, skip initial observation), including patch/create/update SDK surfaces.

Sessions: SessionSummary.last_activity_at reflects when the latest session event was ingested.

User-Agent and package metadata are bumped to 1.0.8; changes are largely Fern-generated client/types plus openapi.json.

^{Reviewed by Cursor Bugbot for commit 1a59155. Bugbot is set up for automated code reviews on this repo. Configure here.}