feat: use session-reported Claude CLI context windows

components/stats-bar.tsx

@@ -1,7 +1,7 @@
 "use client";
 
 import { useCallback, useEffect, useMemo, useRef, useState, type ReactNode } from "react";
-import { subscriptionLabels, subscriptionLabel, type SessionPricing, type TurnUsage } from "@/src/core";
+import { CLAUDE_CODE_PROVIDER, subscriptionLabels, subscriptionLabel, type cliContextWindowOf, type SessionPricing, type TurnUsage } from "@/src/core";
 import { formatTokens, formatUsd, planCostLabel, prettyModel } from "@/components/usage-format";
 import { ModelControl, catalogLimits, useModelCatalog } from "@/components/model-picker";
 
@@ -10,6 +10,15 @@ export function formatContextMeasurement(tokens: number | null, limit: number |
 	return limit === null ? numerator : `${numerator} / ${formatTokens(limit)}`;
 }
 
+/** CLI aliases have no global catalog limit: only this session's matching
+ * response can supply a denominator. Other providers keep their catalog join. */
+export function contextLimitForModel(model: string | undefined, limits: ReadonlyMap<string, number> | undefined,
+	cliWindow: ReturnType<typeof cliContextWindowOf> = null): number | null {
+	if (!model) return null;
+	if (model.startsWith(`${CLAUDE_CODE_PROVIDER}:`)) return cliWindow?.model === model ? cliWindow.tokens : null;
+	return limits?.get(model) ?? null;
+}
+
 /**
  * The below-composer stats bar (wave 4 observability): the session's
  * money/context footprint as one quiet row beneath the composer —
@@ -24,12 +33,14 @@ export function formatContextMeasurement(tokens: number | null, limit: number |
  * Spending arrives already priced by the server through Pi's catalog and
  * calculator. Missing cost stays "—", never fake zero. Context is a separate
  * completed-conversation measurement, never a money-log/summarizer fold or
- * transcript estimate. Its catalog denominator follows the selected model;
- * model changes preserve the numerator. Successful compaction clears it to ?.
+ * transcript estimate. Its denominator follows the selected model, from the
+ * catalog or the session's CLI report; model changes preserve the numerator.
+ * Successful compaction clears the numerator and any old CLI report.
  */
 export function StatsBar({
 	turns,
 	contextTokens = null,
+	cliContextWindow = null,
 	pricing,
 	dictationSlot,
 	chatId,
@@ -38,6 +49,7 @@ export function StatsBar({
 }: {
 	turns: TurnUsage[];
 	contextTokens?: number | null;
+	cliContextWindow?: ReturnType<typeof cliContextWindowOf>;
 	pricing?: SessionPricing;
 	/** The bound session (per-session models, owner 2026-09-28): present
 	 *  on the in-session bar — the model control binds THE SESSION'S own
@@ -86,11 +98,11 @@ export function StatsBar({
 			document.removeEventListener("keydown", onKeyDown);
 		};
 	}, [open]);
-	// Catalog-only denominator; the picker reports its effective selection.
-	// Missing/pending catalog means usage-only, never a hardcoded maximum.
+	// The picker reports its effective selection. CLI windows are session-
+	// scoped; unknown metadata always means usage-only, never a guessed maximum.
 	const { catalog } = useModelCatalog();
 	const limits = useMemo(() => (catalog ? catalogLimits(catalog) : undefined), [catalog]);
-	const limit = selectedModel ? limits?.get(selectedModel) ?? null : null;
+	const limit = contextLimitForModel(selectedModel, limits, cliContextWindow);
 	const contextLabel = formatContextMeasurement(contextTokens, limit);
 	const { cost = 0, unpriced = turns.length, subscription = 0 } = pricing ?? {};
 	// Honest cost: show dollars only when at least one turn priced;
@@ -151,6 +163,9 @@ export function StatsBar({
 									{contextLabel}
 								</span>
 							</div>
+							{selectedModel?.startsWith(`${CLAUDE_CODE_PROVIDER}:`) && (
+								<p>The window is reported by Claude Code’s local summary and may reflect its auto-compaction budget rather than the model’s full maximum. Unavailable windows are omitted.</p>
+							)}
 							<div className="flex justify-between gap-2">
 								<span>{subscription ? "Usage" : "Total cost"}</span>
 								<span className="tabular-nums text-card-foreground">{costLabel}</span>