feat: claude-auto-retry v0.1.0

Auto-retry Claude Code sessions when hitting Anthropic subscription rate limits.
Uses tmux monitoring + send-keys to detect rate limit messages, wait for reset,
and send "continue" automatically. Zero dependencies, zero workflow change.

- Shell wrapper intercepts `claude` command transparently
- Background monitor polls tmux pane for rate limit patterns
- Timezone-aware reset time parsing with DST safety
- Safe send-keys with foreground process verification
- --print mode: buffers output, retries cleanly for pipes
- Config validation prevents bad values from causing crashes
- 59 tests, 0 dependencies

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

test/config.test.js

@@ -0,0 +1,68 @@
+import { describe, it } from 'node:test';
+import assert from 'node:assert/strict';
+import { loadConfig, DEFAULT_CONFIG } from '../src/config.js';
+
+describe('DEFAULT_CONFIG', () => {
+  it('has expected defaults', () => {
+    assert.equal(DEFAULT_CONFIG.maxRetries, 5);
+    assert.equal(DEFAULT_CONFIG.pollIntervalSeconds, 5);
+    assert.equal(DEFAULT_CONFIG.marginSeconds, 60);
+    assert.equal(DEFAULT_CONFIG.fallbackWaitHours, 5);
+    assert.equal(typeof DEFAULT_CONFIG.retryMessage, 'string');
+    assert.deepEqual(DEFAULT_CONFIG.customPatterns, []);
+  });
+});
+
+describe('loadConfig', () => {
+  it('returns defaults when no config file exists', async () => {
+    const config = await loadConfig('/nonexistent/path/.claude-auto-retry.json');
+    assert.deepEqual(config, DEFAULT_CONFIG);
+  });
+  it('merges partial config with defaults', async () => {
+    const { writeFile, unlink } = await import('node:fs/promises');
+    const { tmpdir } = await import('node:os');
+    const { join } = await import('node:path');
+    const f = join(tmpdir(), `car-test-${Date.now()}.json`);
+    await writeFile(f, JSON.stringify({ maxRetries: 10 }));
+    try {
+      const config = await loadConfig(f);
+      assert.equal(config.maxRetries, 10);
+      assert.equal(config.pollIntervalSeconds, 5);
+    } finally { await unlink(f); }
+  });
+  it('returns defaults for invalid JSON', async () => {
+    const { writeFile, unlink } = await import('node:fs/promises');
+    const { tmpdir } = await import('node:os');
+    const { join } = await import('node:path');
+    const f = join(tmpdir(), `car-test-${Date.now()}.json`);
+    await writeFile(f, 'not json{{{');
+    try {
+      const config = await loadConfig(f);
+      assert.deepEqual(config, DEFAULT_CONFIG);
+    } finally { await unlink(f); }
+  });
+  it('rejects string values and falls back to defaults', async () => {
+    const { writeFile, unlink } = await import('node:fs/promises');
+    const { tmpdir } = await import('node:os');
+    const { join } = await import('node:path');
+    const f = join(tmpdir(), `car-test-${Date.now()}.json`);
+    await writeFile(f, JSON.stringify({ maxRetries: "never", pollIntervalSeconds: "fast" }));
+    try {
+      const config = await loadConfig(f);
+      assert.equal(config.maxRetries, 5);
+      assert.equal(config.pollIntervalSeconds, 5);
+    } finally { await unlink(f); }
+  });
+  it('rejects negative numbers and falls back to defaults', async () => {
+    const { writeFile, unlink } = await import('node:fs/promises');
+    const { tmpdir } = await import('node:os');
+    const { join } = await import('node:path');
+    const f = join(tmpdir(), `car-test-${Date.now()}.json`);
+    await writeFile(f, JSON.stringify({ maxRetries: -1, marginSeconds: -10 }));
+    try {
+      const config = await loadConfig(f);
+      assert.equal(config.maxRetries, 5);
+      assert.equal(config.marginSeconds, 60);
+    } finally { await unlink(f); }
+  });
+});