feat(coding-agent): added provider-priority model selection and refined fallback ordering

- Added first-party-first provider priority defaults for model ranking.
- Consolidated model resolution to use getModelMatchPreferences from session settings.
- Prioritized providerPriorityRank ahead of usage rank when picking preferred models.
- Added second-pass fallback to default-model or API-key-valid matching order.

packages/coding-agent/src/commit/model-selection.ts

@@ -3,6 +3,7 @@ import type { Api, ApiKey, Model } from "@oh-my-pi/pi-ai";
 import type { ApiKeyResolverRegistry } from "../config/api-key-resolver";
 import { MODEL_ROLE_IDS } from "../config/model-registry";
 import {
+	getModelMatchPreferences,
 	type ModelLookupRegistry,
 	parseModelPattern,
 	resolveModelRoleValue,
@@ -33,7 +34,7 @@ export async function resolvePrimaryModel(
 	modelRegistry: CommitModelRegistry,
 ): Promise<ResolvedCommitModel> {
 	const available = modelRegistry.getAvailable();
-	const matchPreferences = { usageOrder: settings.getStorage()?.getModelUsageOrder() };
+	const matchPreferences = getModelMatchPreferences(settings);
 	const resolved = override
 		? resolveModelRoleValue(override, available, { settings, matchPreferences, modelRegistry })
 		: resolveRoleSelection(["commit", "smol", ...MODEL_ROLE_IDS], settings, available, modelRegistry);
@@ -73,7 +74,7 @@ export async function resolveSmolModel(
 		}
 	}
 
-	const matchPreferences = { usageOrder: settings.getStorage()?.getModelUsageOrder() };
+	const matchPreferences = getModelMatchPreferences(settings);
 	for (const pattern of MODEL_PRIO.smol) {
 		const candidate = parseModelPattern(pattern, available, matchPreferences, { modelRegistry }).model;
 		if (!candidate) continue;