Wave-5 chunk B: three model slots, search-engine row, first-run setup flow

Chunk B (owner-designed, model-slots wave) on the merged engine surface
(main 1d66a17):

AGENT SECTION — SLOTS ONLY (owner ruling)
- The six per-role model rows are GONE; three slot rows instead:
  Strong (Prober + Teacher), Cheap (five workhorse roles), Vision
  (visual maker + PDF reader), roster + resolved-default in every hint.
- Slot dropdowns share the app's menu language over the FEDERATED
  catalog (/api/models = keyed providers only, fresh per call — saving
  a key in Keys immediately widens the picker); the vision slot
  filters to image-capable models (Model.input); the menu's highlight
  now matches provider+id (ids can collide across providers).
- Slots write the new models section (PUT /api/settings/models) through
  the dialog's write seam; per-role overrides stay schema-only.
- ModelMenuList rows read 'provider · id' — federation makes the
  provider bookkeeping-relevant. Usage stamps render provider-qualified
  (prettyModel(qualified): 'Glm 5.3 Flash · openrouter') in the stats
  bar's turn lines.

SEARCH ENGINE (search wave: no default, owner)
- A row in Tools: Tavily/Brave via the shared-menu look, Automatic =
  the pin removed (auto-activation). The live reason line comes from
  /api/search; no engine key at all grays the whole row + disables the
  trigger (a keyless choice would only block auto-activation).

FIRST-RUN SETUP FLOW (owner design A: composer CTA + send interception)
- Chats cannot start until all three slots are picked — no defaults
  for 33 providers (slotsConfigured: all three slot models required).
- The graph view's new-session dock (home) shows a 'Set up your models'
  CTA while unconfigured; submitting a topic opens the SetupDialog WITH
  THE DRAFT PRESERVED; Save stores the models section and the queued
  message sends. Same interception on /chat/new sends.
- STAGED BY DEPENDENCY (owner: keys first, models after): no keyed
  provider → stage 1 deep-links the settings dialog on Keys (open now
  takes a section); a saved key reopens at stage 2 on the next submit.
- Stage 2: Strong → Cheap → Vision pickers (federated, vision-filtered,
  all three required). Closable without configuring — browsing stays
  possible; the gate is the send, not the dialog. Layered Esc: an open
  slot menu eats Esc before the dialog.
- Two closure bugs caught live: onDone→start/send captured the stale
  pre-save 'configured' (the flow now forces the replayed send); menu-Esc
  used to close the whole dialog.

Settings-dialog provider: open(section?) lands on a section (stage 1
deep-link). Tests: composeSlotModel/composeSearchEngine pure, slot SSR
replacing role rows, slotsConfigured/setupStage first-run gates,
provider-qualified prettyModel. Gates: typecheck, lint, 792/792, build.

components/settings/model-menu.tsx

@@ -31,6 +31,7 @@ function priceLabel(cost: ModelCatalogEntry["cost"]): string {
 export function ModelMenuList({
 	models,
 	effectiveId,
+	effectiveProvider,
 	onPick,
 	footer,
 }: {
@@ -38,6 +39,11 @@ export function ModelMenuList({
 	models: ModelCatalogEntry[] | undefined;
 	/** Currently effective id (the row gets the quiet highlight). */
 	effectiveId: string | undefined;
+	/** The effective id's provider (model-slots wave: the catalog
+	 *  federates multiple providers and ids can collide across them —
+	 *  the highlight must match BOTH coordinates or it lands on the
+	 *  wrong row). */
+	effectiveProvider?: string;
 	/** Receives the chosen entry. */
 	onPick: (entry: ModelCatalogEntry) => void;
 	/** Quiet footer note under the list (context-specific). */
@@ -111,7 +117,7 @@ export function ModelMenuList({
 							onClick={() => onPick(m)}
 							className={`flex w-full flex-col gap-0.5 rounded-lg px-2 py-1.5 text-left outline-none transition-colors hover:bg-muted ${
 								i === menuIdx ? "bg-accent/40 ring-1 ring-inset ring-border" : ""
-							}${m.id === effectiveId && i !== menuIdx ? " bg-muted/60" : ""}`}
+							}${m.id === effectiveId && m.provider === (effectiveProvider ?? m.provider) && i !== menuIdx ? " bg-muted/60" : ""}`}
 						>
 							<span className="flex items-center justify-between gap-2">
 								<span className="truncate text-card-foreground">{m.name}</span>
@@ -120,7 +126,7 @@ export function ModelMenuList({
 								</span>
 							</span>
 							<span className="flex items-center justify-between gap-2 text-muted-foreground">
-								<span className="truncate">{m.id}</span>
+								<span className="truncate">{m.provider} · {m.id}</span>
 								<span className="shrink-0 tabular-nums">{formatTokens(m.contextWindow)}</span>
 							</span>
 						</button>