The workbench for agents.

A subagent you delegated to can now be steered mid-run instead of only killed. Delegated work runs as a blocking loop over a private transcript, so while the parent awaited it a redirect had nowhere to land; steers now reach the live subagent before its next model call and read as new context, not as a tool result.

Agent Chat now carries Chat / Agent tabs above the conversation, so the pane states whether a turn will answer or act on files. Plan and Debug stay reachable and surface as a suffix on the Agent tab instead of being silently reset.

The random crash after several workspace operations is fixed at its root. The repository's ghostty.h had drifted from the header libghostty was built with, so ghostty_surface_config_s was 88 bytes where the library wrote 112 — every surface creation overran 24 bytes into adjacent stack memory, and the damage surfaced later under unrelated names. The root header is now the shipped xcframework header, and a release gate fails the build if they drift again.

Adding a project no longer crashes. The system open panel calls its completion handler from inside its own KVO notification dispatch, so creating the workspace there mutated the tab list while Combine still had per-thread notifications queued; the handler now hops to the next main-actor turn before touching sidebar state.

Adding a project no longer crashes. The workspace context refresh coordinator was resolving a main-actor Workspace handle inside a detached utility task; it now resolves by workspace id on the main actor, so the button that opens a folder stays on the same path as terminal creation.