mesh-knowledge: ask changes in the review for a decision nothing would cite, so its acceptance never turns the module unhealthy (hq issue 504)

The whole-set rule cited ran only after acceptance: the review approved a
decision with no home and no record linking it, the rule then failed, and
the module's health turned red for a fault its author could only repair
after the fact. hq held the rule at the record's own merge. The review now
judges it ahead, before the judgement: such a decision stays proposed with
a changes finding naming the rule. It is not refused at propose, because
no record can link a number only reserved.

modules/mesh-knowledge/cmd/mesh-knowledge/main.go

@@ -918,7 +918,8 @@ func Tools(k *KB, caller func(map[string]any) string) []stdio.Tool {
 				"link to nothing, a clause without a bold lead, a superseded record cited alone, an unknown topic, a retired word. A " +
 				"proposal is revised by proposing it again; an accepted record changes only by a progressive insight (insight: what " +
 				"stood before). The knowledge base then reviews each version itself, in a judgement that sees only the record, the " +
-				"records it links and the rules: on approve it is accepted (a record that needs the operator waits for the operator's " +
+				"records it links and the rules. A decision that names no home and that no accepted record links is not judged: " +
+				"its review asks changes for the whole-set rule cited, which its acceptance would break. On approve it is accepted (a record that needs the operator waits for the operator's " +
 				"Approve), on changes it stays proposed with the findings for its author to revise, and when no judgement can be had " +
 				"it stays proposed and says so. Nothing proposed is in force.",
 			Input: schema([]string{"number", "title"}, map[string]any{
@@ -933,7 +934,7 @@ func Tools(k *KB, caller func(map[string]any) string) []stdio.Tool {
 				"links": map[string]any{"type": "array", "description": "its links: kind, to (\"0276\", \"0276 §4\", \"research 045\", \"issue 365\", a design's path), from (the clause it goes out from)",
 					"items": map[string]any{"type": "object", "properties": map[string]any{"kind": map[string]any{"type": "string", "enum": LinkKinds},
 						"to": text("the target"), "from": integer("the clause of this record it goes out from")}, "required": []string{"kind", "to"}}},
-				"homes":          texts("hq documents that cite it, such as a design's path"),
+				"homes":          texts("hq documents that cite it, such as a design's path; a decision needs one unless an accepted record links it"),
 				"needs-operator": flag("it holds only once the operator approves it"),
 				"status":         map[string]any{"type": "string", "enum": ResearchStatuses, "description": "a research effort's status"},
 				"insight":        text("for an accepted record: a progressive insight, saying what stood before"),