fix(sling): default dispatched_by to human when role unknown

When running gt sling from rig root (e.g., ~/gt/gastown), the role
detection returns 'unknown' because the directory doesn't match any
specific agent pattern. This change provides sensible fallbacks:

- ActorString() returns the rig name when role is unknown but rig is known
- ActorString() returns 'human' when both role and rig are unknown
- detectActor() returns 'human' instead of 'unknown' on GetRole() failure

This enables human operators to sling work from the rig root without
having to cd into a specific agent directory first.

Fixes gt-spt3u

Author: furiosa

internal/cmd/role.go

@@ -283,7 +283,13 @@ func (info RoleInfo) ActorString() string {
 		}
 		return "crew"
 	default:
-		return string(info.Role)
+		// When role is unknown, provide a useful fallback:
+		// - If we know the rig, use it (e.g., "gastown") - implies human operator at rig root
+		// - Otherwise use "human" to indicate a human operator
+		if info.Rig != "" {
+			return info.Rig
+		}
+		return "human"
 	}
 }
 

internal/cmd/sling_helpers.go

@@ -262,10 +262,13 @@ func detectCloneRoot() (string, error) {
 }
 
 // detectActor returns the current agent's actor string for event logging.
+// When running from rig root or without a known agent identity, returns:
+// - The rig name (e.g., "gastown") if we can detect it
+// - "human" as a fallback for human operators
 func detectActor() string {
 	roleInfo, err := GetRole()
 	if err != nil {
-		return "unknown"
+		return "human"
 	}
 	return roleInfo.ActorString()
 }