Add benchmark results for fast3 and fast4, implement KeepAliveLspBridge, and add tests for staged strategies

- Added new benchmark result files: compare_2026-02-09_score_fast3.json and compare_2026-02-09_score_fast4.json.
- Implemented KeepAliveLspBridge to maintain a persistent LSP connection across multiple queries, improving performance.
- Created unit tests for staged clustering strategies in test_staged_stage3_fast_strategies.py, ensuring correct behavior of score and dir_rr strategies.

ccw/src/core/services/cli-session-policy.ts

@@ -0,0 +1,55 @@
+import os from 'os';
+
+export interface CliSessionPolicy {
+  allowedTools: string[];
+  maxSessions: number;
+  idleTimeoutMs: number;
+  allowWorkingDirOutsideProject: boolean;
+  maxBufferBytes: number;
+  rateLimit: {
+    createPerMinute: number;
+    executePerMinute: number;
+    sendBytesPerMinute: number;
+    resizePerMinute: number;
+  };
+}
+
+function parseIntEnv(name: string, fallback: number): number {
+  const raw = (process.env[name] ?? '').trim();
+  if (!raw) return fallback;
+  const n = Number.parseInt(raw, 10);
+  return Number.isFinite(n) ? n : fallback;
+}
+
+function parseBoolEnv(name: string, fallback: boolean): boolean {
+  const raw = (process.env[name] ?? '').trim().toLowerCase();
+  if (!raw) return fallback;
+  if (raw === '1' || raw === 'true' || raw === 'yes' || raw === 'y') return true;
+  if (raw === '0' || raw === 'false' || raw === 'no' || raw === 'n') return false;
+  return fallback;
+}
+
+export function getCliSessionPolicy(): CliSessionPolicy {
+  const defaultAllowedTools = ['claude', 'codex', 'gemini', 'qwen', 'opencode'];
+  const allowedToolsRaw = (process.env.CCW_CLI_SESSIONS_ALLOWED_TOOLS ?? '').trim();
+  const allowedTools = allowedToolsRaw
+    ? allowedToolsRaw.split(',').map((t) => t.trim()).filter(Boolean)
+    : defaultAllowedTools;
+
+  const maxSessionsDefault = os.platform() === 'win32' ? 6 : 8;
+
+  return {
+    allowedTools,
+    maxSessions: parseIntEnv('CCW_CLI_SESSIONS_MAX', maxSessionsDefault),
+    idleTimeoutMs: parseIntEnv('CCW_CLI_SESSIONS_IDLE_TIMEOUT_MS', 30 * 60_000),
+    allowWorkingDirOutsideProject: parseBoolEnv('CCW_CLI_SESSIONS_ALLOW_OUTSIDE_PROJECT', false),
+    maxBufferBytes: parseIntEnv('CCW_CLI_SESSIONS_MAX_BUFFER_BYTES', 2 * 1024 * 1024),
+    rateLimit: {
+      createPerMinute: parseIntEnv('CCW_CLI_SESSIONS_RL_CREATE_PER_MIN', 12),
+      executePerMinute: parseIntEnv('CCW_CLI_SESSIONS_RL_EXECUTE_PER_MIN', 60),
+      sendBytesPerMinute: parseIntEnv('CCW_CLI_SESSIONS_RL_SEND_BYTES_PER_MIN', 256 * 1024),
+      resizePerMinute: parseIntEnv('CCW_CLI_SESSIONS_RL_RESIZE_PER_MIN', 120),
+    },
+  };
+}
+