licence manager: say what moved a binding, why, and who asked (issue 625)

A switch of g14 back to another licence on 2026-10-13 left no trace: the manager logged no line and sent no event for bind, switch or release, and its audit kept only the verb's name. Every change of what a consumer holds now goes to the journal, the audit and a licence.<what> event with the same fields: consumer, licence before and after, generation, why (the verb or the rule) and by (the caller the runtime proved, or the manager itself). The node is told why in the bindings state and says it when it applies. The audit and binding tables become readable through the store's reader. The SDK moves to the version that proves the caller (issue 365).

modules/claude-code/cmd/claude-code/node.go

@@ -298,6 +298,9 @@ type BindingState struct {
 	Licence    string `json:"licence"`
 	Kind       string `json:"kind"`
 	Generation int64  `json:"generation"`
+	// Why and By are what moved the binding and who asked, as the manager recorded it (novox/hq issue 625).
+	Why string `json:"why,omitempty"`
+	By  string `json:"by,omitempty"`
 }
 
 // Current is what the seat answers to `current`: the licence this node is bound to and its token, sealed.
@@ -433,6 +436,15 @@ func OnBinding(p Paths, b *BindingState, ask Ask, write WriteManaged) (string, e
 	if err != nil {
 		return "", err
 	}
+	// The line says which binding this was and why the manager moved it, so a node's journal alone answers
+	// what changed here and who asked (novox/hq issue 625).
+	out["generation"] = b.Generation
+	if b.Why != "" {
+		out["why"] = b.Why
+	}
+	if b.By != "" {
+		out["by"] = b.By
+	}
 	raw, _ := json.Marshal(out)
 	return string(raw), nil
 }