Removed the `connect.NewError(connect.CodeInternal, ...)` wrapper in the
Server's MakeDir proxy handler. Previously, this wrapper was catching
specific agent errors (like CodeAlreadyExists) and casting them into
generic Code 13 (Internal) errors, stripping the gRPC metadata.
This change allows the control-plane to act as a transparent pipeline,
ensuring the API gateway can properly interpret and route specific
filesystem failures.
Wire envd's existing PTY process capabilities through the full stack:
hostagent proto (4 new RPCs: PtyAttach, PtySendInput, PtyResize, PtyKill),
envdclient, sandbox manager, and a new WebSocket endpoint at
GET /v1/sandboxes/{id}/pty with bidirectional JSON message protocol.
Sessions use tag-based identity for disconnect/reconnect support,
base64-encoded PTY data for binary safety, and a 120s inactivity timeout.
Plumb ListDir, MakeDir, and RemovePath through all layers:
REST API → host agent RPC → envdclient → envd. These endpoints
enable a web file browser for sandbox filesystem interaction.
New endpoints (all under requireAPIKeyOrJWT):
- POST /v1/sandboxes/{id}/files/list
- POST /v1/sandboxes/{id}/files/mkdir
- POST /v1/sandboxes/{id}/files/remove
