Delete the checker's hold, its own capacity and places, its node moves and its read of the controller's plans-building, so a check waits only in the build seats' streams (issue 1887 A5b, closes 1685; ADR 0525 §4, §7)

modules/mesh-delivery-checker/internal/check/try.go

@@ -206,13 +206,11 @@ type TryOptions struct {
 	Run   string
 }
 
-// Tryer runs the tries: it takes a queued try, judges it through the same Judge as a pull request's check, and writes its
-// end. It holds no timer: a try starts when its key is written, or when a delivery that held it ends (Reconsider).
+// Tryer runs the tries: it takes a queued try, judges it through the same Judge as a pull request's check (a check ask, ADR
+// 0525 §1), and writes its end. It holds no timer: a try starts when its key is written.
 type Tryer struct {
 	Tries KV
 	Judge Judge
-	// Hold says whether a delivery builds, so no try starts (ADR 0484 clause 12); nil never holds.
-	Hold  func() bool
 	Bound time.Duration
 	Now   func() time.Time
 	Logf  func(format string, args ...any)
@@ -250,7 +248,6 @@ func (tr *Tryer) Put(ctx context.Context, key string, value []byte) {
 	if t.Over() {
 		return
 	}
-	held := tr.Hold != nil && tr.Hold()
 	tr.mu.Lock()
 	if tr.inflight == nil {
 		tr.inflight, tr.seen = map[string]bool{}, map[string]bool{}
@@ -259,11 +256,6 @@ func (tr *Tryer) Put(ctx context.Context, key string, value []byte) {
 		tr.mu.Unlock()
 		return
 	}
-	if held {
-		tr.mu.Unlock() // not seen yet: a try left running is still taken over when the hold ends
-		tr.logf("%s: not started, a delivery builds", key)
-		return
-	}
 	tr.seen[key] = true
 	tr.inflight[key] = true
 	tr.mu.Unlock()