Page an answer larger than one message of the bus, and keep overviews brief (hq issue 314)

The client library refuses to send a reply over the bus's max_payload, and the
controller only logged it: conditions and status answered nobody for hours on
2026-10-08 while calls said each was answered in 130 ms, and the operator's
channel read nothing. An answer too large is now held under its call and paged
to the caller that asks, on the same subject; a caller that does not page is
told in words, and calls says it. The overviews no longer carry every finding:
conditions and status list each condition with its newest evidence, doctor at
most twenty findings a probe (probe= gives one whole), and the JSON overviews
are sent once, as data, instead of twice.

internal/catalogue/verbs.go

@@ -351,6 +351,7 @@ var ControllerVerbs = []Verb{
 			"run":     "\"true\": run every probe now and answer the verdict",
 			"probes":  "\"true\": the registry — what each probe asserts, and the condition it raises",
 			"signals": "\"true\": the signals table, each row with the age of its newest signal",
+			"probe":   "one probe's id (D14): its verdict alone, with every finding — the verdict shows at most twenty a probe",
 		}, nil, "run", "probes", "signals")},
 	// How a module's new builds reach its machines, and the bus's planned step (novox/hq ADR 0236).
 	{Name: "upgrade", Description: "How each module's new builds reach its machines (novox/hq ADR 0236): rolled " +