S3: the indexer takes its own build from MESH_FINGERPRINT first

Builds: design 47 G A-366

Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h

modules/mesh-delivery-indexer/cmd/mesh-delivery-indexer/main.go

@@ -462,7 +462,7 @@ func run(ctx context.Context, getenv func(string) string, logOut io.Writer) erro
 		Predefined: awaitedStore{b: predefined}, ConfigCandidates: awaitedStore{b: configCandidates}, Logf: logger.Printf,
 		Named: namedVia(calls.Call), Trunk: trunkVia(calls.Call), Contains: containsVia(calls.Call), Read: readVia(calls.Call),
 		ReadOpen: openVia(calls.Call), Packages: awaitedStore{b: packages, js: js, name: index.Bucket(cred.Module, index.PackagesState)}, Files: filesVia(calls.Call), GoSum: goSumVia(calls.Call), GoMod: goModVia(calls.Call),
-		OwnBuild: ownBuildVia(calls.Call, cred.Module, cred.Node), OwnBuildState: awaitedStore{b: ownBuildState}, Heard: heardStore, Placement: placementVia(calls.CallKept), RunningWhole: runningWholeVia(js), Runs: awaitedStore{b: runs}, Graph: graph,
+		OwnBuild: ownBuildFirst(process.OwnBuild(), ownBuildVia(calls.Call, cred.Module, cred.Node)), OwnBuildState: awaitedStore{b: ownBuildState}, Heard: heardStore, Placement: placementVia(calls.CallKept), RunningWhole: runningWholeVia(js), Runs: awaitedStore{b: runs}, Graph: graph,
 		SeatDefinitions: awaitedStore{b: seatDefs}, ReadFile: readFileVia(calls.Call), SaySeatDefinition: saySeats,
 		Revisions: revisions, EntryIndex: awaitedStore{b: process.AwaitBucket(ctx, js, conn, index.Bucket(cred.Module, index.EntryIndexState), "no entry is found by its fingerprint", logger.Printf)}, // Message a kept call: a read, called again through a transport fault (ADR 0668 §1)
 		// Each catalog revision may bring another holder of a build seat: the build modules are found again (buildmodules.go).

modules/mesh-delivery-indexer/cmd/mesh-delivery-indexer/named_test.go

@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"git.novox.be/novox/mesh-delivery/modules/mesh-delivery-contracts/go/seats/git"
 	"git.novox.be/novox/mesh-delivery/modules/mesh-delivery-contracts/go/seats/meshpipelinerunner"
+	"git.novox.be/novox/mesh-sdk/go/process"
 	"mesh-delivery-indexer/internal/index"
 	"slices"
 	"strings"
@@ -125,6 +126,25 @@ func TestTheTrunkIsTheDirectoriesTheForgeListsTrees(t *testing.T) { // 1900/AC3
 			t.Errorf("%s: own build = %q %v, want %q", row.name, fp, err, row.want)
 		}
 	}
+	// Design 47 G A-366: a process started with a fingerprint takes it and asks no engine; one started without asks the engine.
+	for _, row := range []struct {
+		name      string
+		started   process.Build
+		want      string
+		wantAsked bool
+	}{
+		{"started with a fingerprint", process.Build{Fingerprint: "src2:env"}, "src2:env", false},
+		{"started without one", process.Build{Unknown: process.OwnBuildUnknown}, "src2:abc", true},
+	} {
+		called := false
+		ask := func(string, any) (json.RawMessage, error) {
+			called = true
+			return json.RawMessage(`{"runs":{"fp":"src2:abc"}}`), nil
+		}
+		if fp, err := ownBuildFirst(row.started, ownBuildVia(ask, "acme-indexer", "n1"))(context.Background()); err != nil || fp != row.want || called != row.wantAsked {
+			t.Errorf("%s: own build = %q %v, engine asked %v, want %q asked %v", row.name, fp, err, called, row.want, row.wantAsked)
+		}
+	}
 	none := func(string, any) (json.RawMessage, error) { return json.RawMessage(`{}`), nil }
 	if _, err := ownBuildVia(none, "acme-indexer", "n1")(context.Background()); err == nil {
 		t.Error("an engine that says nothing runs gave a build")

modules/mesh-delivery-indexer/cmd/mesh-delivery-indexer/ownbuild.go

@@ -5,6 +5,8 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+
+	"git.novox.be/novox/mesh-sdk/go/process"
 )
 
 // compositionVerb is the node-engine seat's read verb that says what runs of a module on a machine (its Runs.FP), asked of
@@ -12,6 +14,17 @@ import (
 // from the trunk's value of itself or the haves bucket.
 const compositionVerb = "seat:node-engine.composition"
 
+// ownBuildFirst is the build the process was started with (mesh-sdk process.OwnBuild: MESH_FINGERPRINT, set by the node-engine
+// and by a unit started by hand); only when it is unset does it ask the engine through ask (design 47 G A-366).
+func ownBuildFirst(started process.Build, ask func(ctx context.Context) (string, error)) func(ctx context.Context) (string, error) {
+	return func(ctx context.Context) (string, error) {
+		if started.Fingerprint != "" {
+			return started.Fingerprint, nil
+		}
+		return ask(ctx)
+	}
+}
+
 // ownBuildVia asks the engine of node which fingerprint of the indexer runs there.
 func ownBuildVia(call toolCaller, module, node string) func(ctx context.Context) (string, error) {
 	return func(context.Context) (string, error) {