Agent-shell 0.78 Adds In-Flight Steering and Persistent Prompt Queuing

Mid-Turn Steering via Agent Client Protocol Agent-shell 0.78 leverages the _session/steering protocol extension to redirect agent execution without terminating turns. Submitting prompts with M-RET triggers agent-shell-busy-submit-override-function to redirect models mid-flight. Standard RET submissions route through agent-shell-busy-submit-default-function to queue subsequent instructions cleanly. ### Persistent Prompt and Workflow Integrations The new writable prompt remains active at the end of the buffer at all times via agent-shell-persistent-prompt-enabled. Users can drop image thumbnails directly from macOS screenshot utilities into the session buffer, displaying an image preview while attaching other file formats as @path references. ### Session Cost and Tool Enhancements Developers tracking API expenditures can toggle cumulative session costs in buffer headers with (setopt agent-shell-show-cost-indicator t). The release also packages agent-shell-org-config for managing agent skills in org-roam, adds transient permission interfaces, and supports Google Antigravity and Qoder CLI runtimes.