Say when the mesh is wrong: conditions, watchdogs, the bus's advisories, doctor (hq to-be 45 Phase 1)

Every one of the 48 core failures of research 031 was found by a person
looking; the mesh's answers carried the fact for whoever asked and told
nobody.

- The condition store (to-be 45 §2): mesh-controller_conditions, one key
  per open condition, written by compare-and-set so a person's silence
  and the watchdogs never lose each other's word; every transition kept
  ninety days in mesh-controller_condition-history and said as the
  seat's events condition-raised / condition-changed / condition-cleared
  (the condition at the top level, with event, at, change, why, show),
  offered again while the bus is away. Raised and cleared by observation
  only; a clearing reopened within ten minutes is the same condition with
  its count up, its silence kept. Verbs: conditions, conditions show,
  conditions silence (a hand act, at most a week), conditions history.
- ADR 0224's provider standing is the first kind, provider-failing, held
  by the provider's events; the provider_standing table is no longer read
  or written (left in place: dropping it is the operator's word).
- status leads with the open conditions, urgent first, and says all well
  only with none open; conditions it cannot read are said and not well.
- The signals table compiled in, one watchdog loop over it every 30s: S1
  heartbeat (3 intervals, asleep machines excepted, control node urgent
  after 30 min), S2 report after a send, S3 plan tier, S4 event loop deaf,
  S5 merge not acted, S6 ask lost, S7 call hung, S8 provider silent, S9
  advisories, S10 self-check silent, S11 node tools silent, S13 stale
  refusals; S12, S14, S15 deferred with their reasons. A row that cannot
  see raises probe-failed and clears nothing. A test generated from the
  table suppresses each signal inside and past its bound.
- The bus's advisories (maximum deliveries, a mesh consumer deleted) and
  the controller's own slow consumer and refused subjects, said in the
  mesh's words.
- doctor: the probe registry D1-D10 (D5 deferred) and DW, every five
  minutes, each in thirty seconds; a probe that cannot run is never a
  pass. D1 validates with mesh-host's own validator. Every run ends with
  the doctor-heartbeat event mesh-watcher listens for.
- The controller is granted its new buckets, events, the two advisories
  and $SRV.INFO; the node tools their tools-alive heartbeat. The streams
  and consumers the controller asserts and the ones D6/D7 expect are one
  derivation.

cmd/mesh-controller/main.go

@@ -153,6 +153,11 @@ func run() error {
 	// What the mesh's bounds will be set from (novox/hq to-be 45 Phase 0).
 	case "durations":
 		return durationsCommand(ctx, args[1:])
+	// What is wrong, and the self-check (novox/hq to-be 45 §2, §4).
+	case "conditions":
+		return conditionsCommand(ctx, args[1:])
+	case "doctor":
+		return doctorCommand(ctx, args[1:])
 	case "version":
 		fmt.Println(version)
 		return nil
@@ -238,6 +243,13 @@ func usage() {
   hand-act record <what> --why <text> --cause <word> [--condition <key>]
                                  record an act done by hand outside the mesh (to-be 45 §7)
   hand-acts [--days N] [--json]  what was done by hand lately, why, and which causes repeat
+  conditions [--scope S] [--severity S] [--machine M] [--json]
+                                 what is wrong now: every open condition, urgent first (to-be 45 §2)
+  conditions show <key>          one condition whole, with its evidence
+  conditions silence <key> --for <d> --why <text>   send no message for it a while; a hand act
+  conditions history [--days N] [--key K]   every raising, change and clearing lately
+  doctor [run|probes|signals] [--json]
+                                 the self-check: the last verdict, a run now, the probes, the signals' ages
   durations [--kind K] [--days N] [--json]
                                  apply, heartbeat, plan-tier and build durations, per machine or module
   collection [--json]            kept archives held/unheld by a manifest, and what the sweep may let go