chore(vendor): import pi 0.85.1

Imported as a linear vendor commit so forge rebases do not replay the upstream root tree.

git-subtree-dir: third_party/pi

git-subtree-split: d981de1229ef899957bbe968bc8dcda02a21f477

third_party/pi/packages/ai/scripts/openrouter-reasoning-options.ts

@@ -0,0 +1,23 @@
+import type { ThinkingLevel, ThinkingLevelMap } from "../src/types.ts";
+import { getEffortThinkingLevelMap } from "./models-dev-reasoning-options.ts";
+
+export interface OpenRouterReasoningMetadata {
+	mandatory?: boolean;
+	default_enabled?: boolean;
+	supported_efforts?: Array<ThinkingLevel | "none">;
+	default_effort?: ThinkingLevel | "none";
+}
+
+/** Convert OpenRouter's reasoning metadata into Pi model capabilities. */
+export function getOpenRouterThinkingLevelMap(
+	reasoning: OpenRouterReasoningMetadata | undefined,
+): ThinkingLevelMap | undefined {
+	if (!reasoning) return undefined;
+	if (!reasoning.supported_efforts?.length) return reasoning.mandatory === true ? { off: null } : undefined;
+
+	// OpenRouter's supported_efforts uses the same effort values as models.dev reasoning_options,
+	// so both sources can share the same Pi thinking-level conversion.
+	const map = getEffortThinkingLevelMap([{ type: "effort", values: reasoning.supported_efforts }]);
+	if (!map) return reasoning.mandatory === true ? { off: null } : undefined;
+	return { ...map, off: reasoning.mandatory === true ? null : "none" };
+}