fix: silence fallback.ts console.error, complete terminal distortion fix, bump v0.9.10

Author: 1bcMax

CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+## 0.9.10 (2026-03-29)
+
+### Bug Fixes
+
+- **Terminal distortion (complete fix)**: `fallback.ts` was still using `console.error` for network error messages (e.g., `[fallback] anthropic/claude-sonnet-4.6 network error: fetch failed`), which printed to stderr — also inherited by Claude Code's terminal. All fallback error messages now go to the log file only. Combined with v0.9.9, brcc is now fully silent while Claude Code is running
+
 ## 0.9.9 (2026-03-28)
 
 ### Bug Fixes

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@blockrun/cc",
-  "version": "0.9.9",
+  "version": "0.9.10",
   "description": "Run Claude Code with any model — no rate limits, no account locks, no phone verification. Pay per use with USDC.",
   "type": "module",
   "bin": {

src/proxy/fallback.ts

@@ -3,6 +3,21 @@
  * Automatically switches to backup models when primary fails (429, 5xx, etc.)
  */
 
+import fs from 'node:fs';
+import os from 'node:os';
+import path from 'node:path';
+
+const LOG_FILE = path.join(os.homedir(), '.blockrun', 'brcc-debug.log');
+
+// eslint-disable-next-line no-control-regex
+const ANSI_RE = /\x1B\[[0-9;]*[A-Za-z]|\x1B\][^\x07]*\x07|\x1B[()][A-B]|\r/g;
+function appendLog(msg: string) {
+  try {
+    fs.mkdirSync(path.dirname(LOG_FILE), { recursive: true });
+    fs.appendFileSync(LOG_FILE, `[${new Date().toISOString()}] ${msg.replace(ANSI_RE, '')}\n`);
+  } catch { /* ignore */ }
+}
+
 export interface FallbackConfig {
   /** Models to try in order of priority */
   chain: string[];
@@ -111,7 +126,7 @@ export async function fetchWithFallback(
       if (nextModel && onFallback) {
         const errMsg = err instanceof Error ? err.message : 'Network error';
         onFallback(model, 0, nextModel);
-        console.error(`[fallback] ${model} network error: ${errMsg}`);
+        appendLog(`[brcc] [fallback] ${model} network error: ${errMsg}`);
       }
 
       if (i < config.chain.length - 1) {