chore: codebase cleanup — remove dead code, consolidate imports, extract constants

- Remove 3 unused exported constants (TRIM_MESSAGES_TO, MAX_TERMINAL_COLS, MAX_TERMINAL_ROWS)
- Consolidate 8 direct util imports into barrel imports (./utils/index.js)
- Extract magic number 8191 to FILE_PEEK_BYTES constant in buffer-limits.ts
- Add explanatory comments to 9 undocumented .catch(() => {}) handlers

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/ai-checker-base.ts

@@ -28,8 +28,7 @@ import { existsSync, readFileSync, unlinkSync, writeFileSync } from 'node:fs';
 import { tmpdir } from 'node:os';
 import { join } from 'node:path';
 import { EventEmitter } from 'node:events';
-import { getAugmentedPath } from './utils/claude-cli-resolver.js';
+import { getAugmentedPath, ANSI_ESCAPE_PATTERN_SIMPLE } from './utils/index.js';
-import { ANSI_ESCAPE_PATTERN_SIMPLE } from './utils/index.js';
 import { AI_CHECK_MAX_BACKOFF_MS } from './config/ai-defaults.js';
 
 // ========== Security Validation ==========

src/config/buffer-limits.ts

@@ -56,11 +56,6 @@ export const TRIM_TEXT_TO = 768 * 1024; // 768KB
  */
 export const MAX_MESSAGES = 1000;
 
-/**
- * Number of messages to keep when trimming (80% of max).
- */
-export const TRIM_MESSAGES_TO = 800;
-
 // ============================================================================
 // Line Buffer Limits
 // ============================================================================
@@ -85,3 +80,14 @@ export const MAX_RESPAWN_BUFFER_SIZE = 1 * 1024 * 1024; // 1MB
  * Size to trim respawn buffer to when max is exceeded.
  */
 export const TRIM_RESPAWN_BUFFER_TO = 512 * 1024; // 512KB
+
+// ============================================================================
+// File Peek Limits
+// ============================================================================
+
+/**
+ * Maximum bytes to read when peeking at the beginning of a file.
+ * Used with `createReadStream({ end })` (inclusive) to read the first 8KB,
+ * which is enough to extract metadata from the first few JSONL lines.
+ */
+export const FILE_PEEK_BYTES = 8 * 1024 - 1; // 8KB (inclusive end offset)

src/config/terminal-limits.ts

@@ -11,11 +11,5 @@
 /** Max input length per API request (bytes) */
 export const MAX_INPUT_LENGTH = 64 * 1024;
 
-/** Max terminal columns for resize requests */
-export const MAX_TERMINAL_COLS = 500;
-
-/** Max terminal rows for resize requests */
-export const MAX_TERMINAL_ROWS = 200;
-
 /** Max session name length (chars) */
 export const MAX_SESSION_NAME_LENGTH = 128;

src/plan-orchestrator.ts

@@ -521,7 +521,7 @@ export class PlanOrchestrator {
     } finally {
       // Always clean up session and progress interval — centralizing here
       // prevents the race where cancel() and catch both try to manage the set
-      await session.stop().catch(() => {});
+      await session.stop().catch(() => {}); // Ignore - session cleanup is best-effort in finally block
       this.runningSessions.delete(session);
       clearInterval(progressInterval);
     }
@@ -651,7 +651,7 @@ export class PlanOrchestrator {
     } finally {
       // Always clean up session and progress interval — centralizing here
       // prevents the race where cancel() and catch both try to manage the set
-      await session.stop().catch(() => {});
+      await session.stop().catch(() => {}); // Ignore - session cleanup is best-effort in finally block
       this.runningSessions.delete(session);
       clearInterval(progressInterval);
     }

src/respawn-controller.ts

@@ -49,8 +49,7 @@ import { Session } from './session.js';
 import { AiIdleChecker, type AiCheckResult, type AiCheckState } from './ai-idle-checker.js';
 import { AiPlanChecker, type AiPlanCheckResult } from './ai-plan-checker.js';
 import type { TeamWatcher } from './team-watcher.js';
-import { BufferAccumulator } from './utils/buffer-accumulator.js';
+import { BufferAccumulator, ANSI_ESCAPE_PATTERN_SIMPLE, assertNever, CleanupManager } from './utils/index.js';
-import { ANSI_ESCAPE_PATTERN_SIMPLE, assertNever, CleanupManager } from './utils/index.js';
 import { MAX_RESPAWN_BUFFER_SIZE, TRIM_RESPAWN_BUFFER_TO as RESPAWN_BUFFER_TRIM_SIZE } from './config/buffer-limits.js';
 import {
   isCompletionMessage,

src/session-cli-builder.ts

@@ -9,7 +9,7 @@
  */
 
 import type { ClaudeMode } from './types.js';
-import { getAugmentedPath } from './utils/claude-cli-resolver.js';
+import { getAugmentedPath } from './utils/index.js';
 
 /**
  * Build Claude CLI permission flags based on the configured mode.

src/session.ts

@@ -48,8 +48,8 @@ import type { TerminalMultiplexer, MuxSession } from './mux-interface.js';
 import { TaskTracker, type BackgroundTask } from './task-tracker.js';
 import { RalphTracker } from './ralph-tracker.js';
 import { BashToolParser } from './bash-tool-parser.js';
-import { BufferAccumulator } from './utils/buffer-accumulator.js';
 import {
+  BufferAccumulator,
   ANSI_ESCAPE_PATTERN_FULL,
   TOKEN_PATTERN,
   SPINNER_PATTERN,

src/subagent-watcher.ts

@@ -17,7 +17,7 @@
  * Tracks per-agent: status, token counts, model, description, tool call count, liveness (PID).
  *
  * @dependencies config/map-limits (MAX_TRACKED_AGENTS, PENDING_TOOL_CALL_TTL_MS),
- *   utils (CleanupManager, KeyedDebouncer)
+ *   config/buffer-limits (FILE_PEEK_BYTES), utils (CleanupManager, KeyedDebouncer)
  * @consumedby web/server (SSE broadcast), session (subagent-session correlation)
  * @emits subagent:discovered, subagent:updated, subagent:tool_call, subagent:tool_result,
  *   subagent:progress, subagent:message, subagent:completed
@@ -35,6 +35,7 @@ import { execFile } from 'node:child_process';
 import { readFile, readdir, stat as statAsync } from 'node:fs/promises';
 import { PENDING_TOOL_CALL_TTL_MS, MAX_PENDING_TOOL_CALLS, MAX_TRACKED_AGENTS } from './config/map-limits.js';
 import { STALE_DATA_MAX_AGE_MS } from './config/server-timing.js';
+import { FILE_PEEK_BYTES } from './config/buffer-limits.js';
 import { CleanupManager, KeyedDebouncer } from './utils/index.js';
 
 // ========== Types ==========
@@ -1009,7 +1010,7 @@ export class SubagentWatcher extends EventEmitter {
   private async extractDescriptionFromFile(filePath: string): Promise<string | undefined> {
     try {
       // Only read the first 8KB — more than enough for 5 JSONL lines
-      const stream = createReadStream(filePath, { end: 8191 });
+      const stream = createReadStream(filePath, { end: FILE_PEEK_BYTES });
       const rl = createInterface({ input: stream });
 
       return await new Promise<string | undefined>((resolve) => {
@@ -1141,10 +1142,10 @@ export class SubagentWatcher extends EventEmitter {
 
           if (this.fileAgentContext.has(filePath)) {
             // Known file — handle content change
-            this.handleFileChange(filePath).catch(() => {});
+            this.handleFileChange(filePath).catch(() => {}); // Ignore - errors logged internally, don't crash watcher callback
           } else {
             // New file — register it
-            this.registerAgentFile(filePath, projectHash, sessionId).catch(() => {});
+            this.registerAgentFile(filePath, projectHash, sessionId).catch(() => {}); // Ignore - errors logged internally, don't crash watcher callback
           }
         });
       });

src/team-watcher.ts

@@ -61,7 +61,7 @@ export class TeamWatcher extends EventEmitter {
         persistent: false,
       });
 
-      const teamsHandler = () => this.pollAsync().catch(() => {});
+      const teamsHandler = () => this.pollAsync().catch(() => {}); // Ignore - poll errors are non-fatal, next poll will retry
       this.teamsWatcher.on('add', teamsHandler);
       this.teamsWatcher.on('change', teamsHandler);
       this.teamsWatcher.on('unlink', teamsHandler);
@@ -82,8 +82,8 @@ export class TeamWatcher extends EventEmitter {
         persistent: false,
       });
 
-      this.tasksWatcher.on('add', () => this.pollTasks().catch(() => {}));
+      this.tasksWatcher.on('add', () => this.pollTasks().catch(() => {})); // Ignore - poll errors are non-fatal, next poll will retry
-      this.tasksWatcher.on('change', () => this.pollTasks().catch(() => {}));
+      this.tasksWatcher.on('change', () => this.pollTasks().catch(() => {})); // Ignore - poll errors are non-fatal, next poll will retry
       this.tasksWatcher.on('error', (err) => {
         console.warn('[TeamWatcher] chokidar tasks watcher error:', err);
       });
@@ -95,11 +95,11 @@ export class TeamWatcher extends EventEmitter {
   stop(): void {
     // Close chokidar watchers
     if (this.teamsWatcher) {
-      this.teamsWatcher.close().catch(() => {});
+      this.teamsWatcher.close().catch(() => {}); // Ignore - watcher cleanup is best-effort during shutdown
       this.teamsWatcher = null;
     }
     if (this.tasksWatcher) {
-      this.tasksWatcher.close().catch(() => {});
+      this.tasksWatcher.close().catch(() => {}); // Ignore - watcher cleanup is best-effort during shutdown
       this.tasksWatcher = null;
     }
     if (this.pollTimer) {

src/tmux-manager.ts

@@ -40,8 +40,7 @@ import {
   type SessionMode,
   type OpenCodeConfig,
 } from './types.js';
-import { wrapWithNice } from './utils/nice-wrapper.js';
+import { wrapWithNice, SAFE_PATH_PATTERN, findClaudeDir, resolveOpenCodeDir } from './utils/index.js';
-import { SAFE_PATH_PATTERN } from './utils/regex-patterns.js';
 import type {
   TerminalMultiplexer,
   MuxSession,
@@ -50,11 +49,6 @@ import type {
   RespawnPaneOptions,
 } from './mux-interface.js';
 
-// Claude CLI PATH resolution — shared utility
-import { findClaudeDir } from './utils/claude-cli-resolver.js';
-// OpenCode CLI PATH resolution
-import { resolveOpenCodeDir } from './utils/opencode-cli-resolver.js';
-
 // ============================================================================
 // Timing Constants
 // ============================================================================

src/web/routes/ralph-routes.ts

@@ -505,7 +505,7 @@ export function registerRalphRoutes(
       settings.lastUsedCase = caseName;
       const dir = dirname(SETTINGS_PATH);
       if (!existsSync(dir)) mkdirSync(dir, { recursive: true });
-      fs.writeFile(SETTINGS_PATH, JSON.stringify(settings, null, 2)).catch(() => {});
+      fs.writeFile(SETTINGS_PATH, JSON.stringify(settings, null, 2)).catch(() => {}); // Ignore - persisting lastUsedCase is non-critical
     } catch {
       /* non-critical */
     }

src/web/schemas.ts

@@ -8,7 +8,7 @@
  */
 
 import { z } from 'zod';
-import { SAFE_PATH_PATTERN } from '../utils/regex-patterns.js';
+import { SAFE_PATH_PATTERN } from '../utils/index.js';
 
 // ========== Path Validation ==========