feat: added Codex saved reset-credit redemption flow to usage tooling

- Added Codex reset-credit models, endpoints, and redemption methods.
- Added reset-credit usage data and cache invalidation for successful redemption.
- Added `/reset-usage` slash command and interactive account selector flow.
- Added contract tests for reset-credit listing, fallback, and consume outcomes.

packages/coding-agent/src/modes/controllers/command-controller.ts

@@ -1528,6 +1528,29 @@ function renderUsageReports(
 			lines.push(`  ${uiTheme.fg("accent", "in use by this session:")} ${activeAccountLabel}`);
 		}
 
+		const resetAccountLines: string[] = [];
+		for (const report of providerReports) {
+			const count = report.resetCredits?.availableCount ?? 0;
+			if (count <= 0) continue;
+			const label =
+				(report.metadata?.email as string | undefined) ??
+				(report.metadata?.accountId as string | undefined) ??
+				"account";
+			const isActive =
+				!!activeAccount &&
+				((!!activeAccount.accountId && activeAccount.accountId === report.metadata?.accountId) ||
+					(!!activeAccount.email && activeAccount.email === report.metadata?.email));
+			resetAccountLines.push(
+				`    • ${label}: ${count} saved reset${count === 1 ? "" : "s"}${isActive ? " (active)" : ""}`,
+			);
+		}
+		if (resetAccountLines.length > 0) {
+			lines.push(
+				`  ${uiTheme.fg("accent", "Saved rate-limit resets")} ${uiTheme.fg("dim", "(/reset-usage to spend)")}`,
+			);
+			for (const line of resetAccountLines) lines.push(uiTheme.fg("dim", line));
+		}
+
 		const renderableGroups = Array.from(limitGroups.values()).map(group => {
 			const entries = group.limits.map((limit, index) => ({
 				limit,