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/api/ui_handlers.go

@@ -16,6 +16,7 @@ import (
 	"gopkg.in/yaml.v3"
 
 	"vetting/internal/events"
+	"vetting/internal/logs"
 	"vetting/internal/model"
 	"vetting/internal/orchestrator"
 	"vetting/internal/store"
@@ -30,6 +31,7 @@ type UI struct {
 	SpecDiffs *store.SpecDiffs
 	Artifacts *store.Artifacts
 	EventHub  *events.Hub
+	Logs      *logs.Hub
 	Runner    *orchestrator.Runner
 	Tiles     *TileEnricher
 	PublicURL string // user-visible base URL baked into the quick-register one-liner
@@ -113,10 +115,15 @@ func (u *UI) HostDetail(w http.ResponseWriter, r *http.Request) {
 		}
 	}
 	t := u.Tiles.Build(r.Context(), *host, latest)
+	replay := ""
+	if latest != nil && u.Logs != nil {
+		replay = u.Logs.Replay(latest.ID)
+	}
 	data := templates.HostDetailData{
 		Tile:      t,
 		Stages:    stages,
 		SpecDiffs: diffs,
+		LogReplay: replay,
 	}
 	_ = templates.HostDetail(data).Render(r.Context(), w)
 }