Replace flat CodeResult with a proper model hierarchy: Execution
(top-level), Result (per-output with typed MIME fields), Logs
(stdout/stderr as lists), and ExecutionError (structured
name/value/traceback). Handle display_data messages for rich output,
add streaming callbacks (on_result, on_stdout, on_stderr, on_error),
and remove the misleading stdout-to-text fallback.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Add sandbox filesystem methods (list_dir, mkdir, remove, upload,
download, stream_upload, stream_download) and interactive PTY sessions
(PtySession, AsyncPtySession) with reconnect support per
FILE_TERMINAL.md spec. Refactor error handling into exceptions.py as
shared handle_response(). Replace API-key-only proxy auth with unified
_proxy_headers() supporting both API key and JWT. Fix stream_upload to
build multipart manually instead of relying on httpx files= with
generators. Switch Makefile SPEC_URL from main to dev branch. Regenerate
models from updated OpenAPI spec (adds teams, channels, metrics, PTY
endpoints). Add comprehensive unit and integration tests. Trim AGENTS.md
to verified facts only.
