Host detail v2: full pipeline + per-stage logs + WoL diagnostics

Pipeline now always renders all 13 nodes (3 pre-stage + 9 stage +
Completed), synthesising ghosts from run state when stage rows
aren't seeded yet. Makes a WaitingWoL host show the full timeline
ahead of it instead of just 4 dots.

Agent tags each log line with its stage; logs.Hub fans out to both
log-{runID} and log-{runID}-{stage} SSE events so the detail page
can show per-stage tabs with a pure-CSS radio-sibling switch. Flat
run log prepends [stage] so grep still works.

Dispatcher writes picked/sent-WoL/heartbeat lines into the per-run
log — the operator opens the detail page, sees WaitingWoL stuck,
and reads exactly what the dispatcher did and why nothing's
progressing, instead of having to tail journalctl on the LXC.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

internal/orchestrator/dispatcher_test.go

@@ -0,0 +1,47 @@
+package orchestrator
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"vetting/internal/events"
+	"vetting/internal/logs"
+)
+
+// TestDispatcher_RunLogWritesToHub verifies the plumbing between the
+// dispatcher and the per-run log hub: runLog must persist to the on-disk
+// file so the detail page's replay + SSE fan-out see the same
+// pre-stage diagnostics (picked / sent WoL / heartbeat).
+func TestDispatcher_RunLogWritesToHub(t *testing.T) {
+	dir := t.TempDir()
+	ev := events.NewHub()
+	lh, err := logs.NewHub(dir, ev)
+	if err != nil {
+		t.Fatalf("NewHub: %v", err)
+	}
+	defer lh.Close()
+
+	d := &Dispatcher{Logs: lh}
+	d.runLog(7, "info", "dispatcher: sent WoL packet to aa:bb:cc:dd:ee:ff via 10.0.0.255:9")
+
+	body, err := os.ReadFile(filepath.Join(dir, "run-7.log"))
+	if err != nil {
+		t.Fatalf("read run log: %v", err)
+	}
+	if !strings.Contains(string(body), "dispatcher: sent WoL packet") {
+		t.Fatalf("run log missing dispatcher line: %q", body)
+	}
+	if !strings.Contains(string(body), "INFO") {
+		t.Fatalf("run log missing level: %q", body)
+	}
+}
+
+// TestDispatcher_RunLogNilHubDoesNotPanic: tests construct Dispatcher
+// directly without a hub. runLog must degrade to stderr rather than
+// panicking so the dispatcher loop stays alive.
+func TestDispatcher_RunLogNilHubDoesNotPanic(t *testing.T) {
+	d := &Dispatcher{}
+	d.runLog(1, "info", "fallback path")
+}