Write into a file the machine shares instead of over it, and reload a service that re-reads its configuration instead of restarting it (hq ADR 0102)

internal/store/store.go

@@ -69,6 +69,19 @@ type Applied struct {
 	// person who edits a managed file watches their change vanish every few minutes with nothing
 	// anywhere saying why.
 	Wrote string `json:"wrote,omitempty"`
+
+	// Into is set for a file written into rather than over (novox/hq ADR 0102): the format, what
+	// each of the mesh's keys held before it set them, which of them were absent, and whether the
+	// file itself was — so undeclaring it gives the machine back exactly what it had.
+	Into *Into `json:"into,omitempty"`
+}
+
+// Into is what a file written into held before the mesh's keys.
+type Into struct {
+	Format  string                     `json:"format"`
+	Before  map[string]json.RawMessage `json:"before,omitempty"`
+	Absent  []string                   `json:"absent,omitempty"`
+	Created bool                       `json:"created,omitempty"`
 }
 
 // State is the whole of what a node knows about what it has done.