Function resolve_agent_context 

pub(crate) fn resolve_agent_context(
    store: &Store,
    block_id: &str,
) -> Result<AgentContext, String>

Walk block → tab → workspace → window from an agent pane’s block id.

Tabs carry no parent reference, so the workspace and window are found by reverse lookup: the workspace whose tabids/pinnedtabids contains the tab, then the window assigned that workspace. window_id/workspace_id are None when the tab isn’t attached to a live window (e.g. a torn-off tab mid-transition) — callers should treat that as “no window to name”.