feat: Phase 0+1 — repo sync, pino, lint fixes, core components

Phase 0:
- Synced latest live-status.js from workspace (9928 bytes)
- Fixed 43 lint issues: empty catch blocks, console statements
- Added pino dependency
- Created src/tool-labels.json with all known tool mappings
- make check passes

Phase 1 (Core Components):
- src/config.js: env-var config with validation, throws on missing required vars
- src/logger.js: pino singleton with child loggers, level validation
- src/circuit-breaker.js: CLOSED/OPEN/HALF_OPEN state machine with callbacks
- src/tool-labels.js: exact/prefix/regex tool->label resolver with external override
- src/status-box.js: Mattermost post manager (keepAlive, throttle, retry, circuit breaker)
- src/status-formatter.js: pure SessionState->text formatter (nested, compact)
- src/health.js: HTTP health endpoint + metrics
- src/status-watcher.js: JSONL file watcher (inotify, compaction detection, idle detection)

Tests:
- test/unit/config.test.js: 7 tests
- test/unit/circuit-breaker.test.js: 12 tests
- test/unit/logger.test.js: 5 tests
- test/unit/status-formatter.test.js: 20 tests
- test/unit/tool-labels.test.js: 15 tests

All 59 unit tests pass. make check clean.

src/config.js

@@ -0,0 +1,112 @@
+'use strict';
+
+/**
+ * config.js — Centralized env-var config with validation.
+ * All config is read from environment variables.
+ * Throws on missing required variables at startup.
+ */
+
+function getEnv(name, defaultValue, required = false) {
+  const val = process.env[name];
+  if (val === undefined || val === '') {
+    if (required) {
+      throw new Error(`Required environment variable ${name} is not set`);
+    }
+    return defaultValue;
+  }
+  return val;
+}
+
+function getEnvInt(name, defaultValue, required = false) {
+  const val = getEnv(name, undefined, required);
+  if (val === undefined) return defaultValue;
+  const n = parseInt(val, 10);
+  if (isNaN(n)) throw new Error(`Environment variable ${name} must be an integer, got: ${val}`);
+  return n;
+}
+
+function getEnvBool(name, defaultValue) {
+  const val = process.env[name];
+  if (val === undefined || val === '') return defaultValue;
+  return val === '1' || val.toLowerCase() === 'true' || val.toLowerCase() === 'yes';
+}
+
+/**
+ * Build and validate the config object.
+ * Called once at startup; throws on invalid config.
+ */
+function buildConfig() {
+  const config = {
+    // Mattermost API
+    mm: {
+      token: getEnv('MM_BOT_TOKEN', null, true),
+      baseUrl: getEnv('MM_BASE_URL', 'https://slack.solio.tech'),
+      maxSockets: getEnvInt('MM_MAX_SOCKETS', 4),
+    },
+
+    // Transcript directory (OpenClaw agents)
+    transcriptDir: getEnv('TRANSCRIPT_DIR', '/home/node/.openclaw/agents'),
+
+    // Timing
+    throttleMs: getEnvInt('THROTTLE_MS', 500),
+    idleTimeoutS: getEnvInt('IDLE_TIMEOUT_S', 60),
+    sessionPollMs: getEnvInt('SESSION_POLL_MS', 2000),
+
+    // Limits
+    maxActiveSessions: getEnvInt('MAX_ACTIVE_SESSIONS', 20),
+    maxMessageChars: getEnvInt('MAX_MESSAGE_CHARS', 15000),
+    maxStatusLines: getEnvInt('MAX_STATUS_LINES', 20),
+    maxRetries: getEnvInt('MAX_RETRIES', 3),
+
+    // Circuit breaker
+    circuitBreakerThreshold: getEnvInt('CIRCUIT_BREAKER_THRESHOLD', 5),
+    circuitBreakerCooldownS: getEnvInt('CIRCUIT_BREAKER_COOLDOWN_S', 30),
+
+    // Health check
+    healthPort: getEnvInt('HEALTH_PORT', 9090),
+
+    // Logging
+    logLevel: getEnv('LOG_LEVEL', 'info'),
+
+    // PID file
+    pidFile: getEnv('PID_FILE', '/tmp/status-watcher.pid'),
+
+    // Offset persistence
+    offsetFile: getEnv('OFFSET_FILE', '/tmp/status-watcher-offsets.json'),
+
+    // Optional external tool labels override
+    toolLabelsFile: getEnv('TOOL_LABELS_FILE', null),
+
+    // Fallback channel for non-MM sessions (null = skip)
+    defaultChannel: getEnv('DEFAULT_CHANNEL', null),
+
+    // Feature flags
+    enableFsWatch: getEnvBool('ENABLE_FS_WATCH', true),
+  };
+
+  // Validate MM base URL
+  try {
+    new URL(config.mm.baseUrl);
+  } catch (_e) {
+    throw new Error(`MM_BASE_URL is not a valid URL: ${config.mm.baseUrl}`);
+  }
+
+  return config;
+}
+
+// Singleton — built once, exported
+let _config = null;
+
+function getConfig() {
+  if (!_config) {
+    _config = buildConfig();
+  }
+  return _config;
+}
+
+// Allow resetting config in tests
+function resetConfig() {
+  _config = null;
+}
+
+module.exports = { getConfig, resetConfig, buildConfig };