fix: handled unknown model limits as null to avoid artificial token caps

- Replaced unknown model contextWindow/maxTokens sentinels with nullable values across types and catalog data.
- Mapped request token calculations to treat null maxTokens as unlimited output caps.
- Updated remote compaction and context checks to ignore unknown limits by using Infinity/0 fallbacks.
- Adjusted CLI/model registry flows to skip cap enforcement for null limits and render unknown values as '-'.

packages/coding-agent/src/cli/models-cli.ts

@@ -68,8 +68,8 @@ interface ModelJson {
 	id: string;
 	selector: string;
 	name: string;
-	contextWindow: number;
-	maxTokens: number;
+	contextWindow: number | null;
+	maxTokens: number | null;
 	reasoning: boolean;
 	/** Supported thinking efforts when the model thinks, otherwise null. */
 	thinking: readonly Effort[] | null;
@@ -81,8 +81,8 @@ interface CanonicalJson {
 	id: string;
 	selected: string;
 	variants: number;
-	contextWindow: number;
-	maxTokens: number;
+	contextWindow: number | null;
+	maxTokens: number | null;
 }
 
 interface ModelsJson {
@@ -97,6 +97,10 @@ function writeLine(line = ""): void {
 	process.stdout.write(`${line}\n`);
 }
 
+function formatLimit(n: number | null): string {
+	return n === null ? "-" : formatNumber(n);
+}
+
 function byProviderThenId(left: Model<Api>, right: Model<Api>): number {
 	const providerCmp = left.provider.localeCompare(right.provider);
 	if (providerCmp !== 0) return providerCmp;
@@ -229,8 +233,8 @@ function renderProviderModels(
 		writeLine(`${chalk.bold.cyan(provider)} ${chalk.dim(`(${models.length})`)}`);
 		const rows = models.map(model => [
 			model.id,
-			formatNumber(model.contextWindow),
-			formatNumber(model.maxTokens),
+			formatLimit(model.contextWindow),
+			formatLimit(model.maxTokens),
 			model.thinking ? getSupportedEfforts(model).join(",") : model.reasoning ? "yes" : "-",
 			model.input.includes("image") ? "yes" : "no",
 		]);
@@ -293,8 +297,8 @@ function renderCanonicalModels(modelRegistry: ModelRegistry, pattern: string | u
 			record.id,
 			`${model.provider}/${model.id}`,
 			String(record.variants.length),
-			formatNumber(model.contextWindow),
-			formatNumber(model.maxTokens),
+			formatLimit(model.contextWindow),
+			formatLimit(model.maxTokens),
 		]);
 	for (const line of boxTable(
 		[