The node-engine serves manifest-reads and says manifest-reads-changed once per link (ADR 0618 §3, §4, issue 774)

Claude-Session: https://claude.ai/code/session_01JG73KG7AfSdh6FP8VrBqCn

internal/link/handacts.go

@@ -16,6 +16,7 @@ import (
 	stdio "git.novox.be/novox/mesh-sdk/go"
 	"git.novox.be/novox/mesh-sdk/go/asker"
 	"git.novox.be/novox/mesh-sdk/go/asks"
+	"git.novox.be/novox/mesh-sdk/go/delivery"
 )
 
 // The node seat node-engine's acts (novox/hq ADR 0563).
@@ -50,6 +51,8 @@ const (
 	// ActPullWaits reads the failed applies that wait on a store's holder, and the last retry with its trigger (design 51,
 	// issue 1966 ENG-9).
 	ActPullWaits = "pull-waits"
+	// ActManifestReads reads the reader capabilities this engine states (novox/hq ADR 0618 §3).
+	ActManifestReads = "manifest-reads"
 )
 
 // The states of an act.
@@ -154,6 +157,9 @@ type HandActs struct {
 	ComposeCandidate func(candidate string, input bool) (any, error)
 	// PullWaits answers which failed applies wait on which store's holder, and the last retry of each with what triggered it.
 	PullWaits func() (any, error)
+	// ManifestReads is what this engine states it reads of a manifest and when its record last carried them (the verb
+	// manifest-reads, novox/hq ADR 0618 §3).
+	ManifestReads func() ([]string, time.Time)
 	// Say says one of the seat's events, asked, done or refused; nil says nothing.
 	Say func(event string, body any)
 	Now func() time.Time
@@ -240,6 +246,12 @@ func (h *HandActs) Call(c EngineCall) (any, error) {
 			return nil, errors.New("this engine waits on no store yet: its node agent has not started")
 		}
 		return h.PullWaits()
+	case ActManifestReads:
+		if h.ManifestReads == nil {
+			return nil, errors.New("this engine states no manifest reads yet: its node agent has not started")
+		}
+		reads, at := h.ManifestReads()
+		return delivery.ManifestReadsAnswer{V: delivery.Version, Node: h.Node, ManifestReads: reads, StatedAt: at}, nil
 	case "acts":
 		if id := arg("id"); id != "" {
 			return h.Act(id)