fix: keep research available without search keys

components/settings/agent-section.tsx

@@ -131,19 +131,6 @@ export function composeGraphTools(agent: AgentSettings | undefined, on: boolean)
 	return { ...agent, graphTools: { enabled: on } };
 }
 
-/** The research tool runs on the search port — the teacher registry DROPS
- *  it when no engine is live (chat-handler's searchAvailable, the same
- *  /api/search signal the section fetches). Pure — exported for tests.
- *  Teacher-stream flag 2026-09-22: the settings row grays on the SAME
- *  signal, so the row and the actual registry availability can never
- *  disagree. `search === null` (loading/failed) grays NOTHING. */
-export function researchToolUnavailable(
-	toolId: string,
-	search: { available: boolean } | null,
-): boolean {
-	return toolId === "research" && search !== null && !search.available;
-}
-
 /** Compose: one slot's model/thinking override. Empty model = absent
  *  override (Default — falls to the factory pin); empty thinking = the
  *  tier keeps its resolved thinking budget. Per-field independence, same
@@ -792,28 +779,19 @@ export function AgentSection({
 						</SettingsRow>
 					);
 				})()}
-				{TOGGLE_TOOLS.map((id) => {
-					// Research needs a live search engine; the row + toggle gray
-					// on the same signal the registry drops the tool on (see
-					// researchToolUnavailable). The reason rides as the hint.
-					const searchDown = researchToolUnavailable(id, search);
-					return (
-						<SettingsRow
-							key={id}
-							label={`Tool · ${id}`}
-							hint={searchDown ? search?.reason : undefined}
-							testid={`tool-row-${id}`}
-							dimmed={searchDown}
-						>
-							<Toggle
-								checked={agent?.tools?.[id] ?? true}
-								disabled={searchDown}
-								label={`tool ${id}`}
-								onChange={(on) => onSectionChange(composeTool(agent, id, on))}
-							/>
-						</SettingsRow>
-					);
-				})}
+				{TOGGLE_TOOLS.map((id) => (
+					<SettingsRow
+						key={id}
+						label={`Tool · ${id}`}
+						testid={`tool-row-${id}`}
+					>
+						<Toggle
+							checked={agent?.tools?.[id] ?? true}
+							label={`tool ${id}`}
+							onChange={(on) => onSectionChange(composeTool(agent, id, on))}
+						/>
+					</SettingsRow>
+				))}
 				{(() => {
 					const engine = agent?.search?.engine ?? null;
 					const anyKey = engineKeys.tavily === true || engineKeys.brave === true;