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/tests/cli-session-command-builder.test.js

@@ -0,0 +1,62 @@
+/**
+ * Unit tests for PTY session execute command builder
+ */
+
+import { describe, it } from 'node:test';
+import assert from 'node:assert/strict';
+
+const builderUrl = new URL('../dist/core/services/cli-session-command-builder.js', import.meta.url).href;
+
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+let mod;
+
+describe('buildCliSessionExecuteCommand', async () => {
+  mod = await import(builderUrl);
+
+  it('builds a node-piped command with resume + promptConcat', () => {
+    const { command } = mod.buildCliSessionExecuteCommand({
+      projectRoot: 'D:\\\\Claude_dms3',
+      shellKind: 'pwsh',
+      tool: 'codex',
+      prompt: 'line1\nline2',
+      mode: 'write',
+      workingDir: 'D:\\\\Claude_dms3',
+      resumeStrategy: 'promptConcat',
+      prevExecutionId: 'prev-123',
+      executionId: 'rk-1'
+    });
+
+    assert.match(command, /^node -e "process\.stdout\.write\(Buffer\.from\('/);
+    assert.match(command, /\| node /);
+    assert.match(command, / cli\b/);
+    assert.match(command, / --tool codex\b/);
+    assert.match(command, / --mode write\b/);
+    assert.match(command, / --stream\b/);
+    assert.match(command, / --id rk-1\b/);
+    assert.match(command, / --resume prev-123\b/);
+    assert.match(command, / --no-native\b/);
+  });
+
+  it('uses wslpath to pass Windows paths to node.exe in wsl-bash', () => {
+    const { command } = mod.buildCliSessionExecuteCommand({
+      projectRoot: 'D:\\\\Claude_dms3',
+      shellKind: 'wsl-bash',
+      tool: 'claude',
+      prompt: 'hello',
+      mode: 'analysis',
+      workingDir: 'D:\\\\Claude_dms3',
+      resumeStrategy: 'nativeResume',
+      executionId: 'exec-1'
+    });
+
+    assert.match(command, /^CCW_WIN=\$\(\s*wslpath -w /);
+    assert.match(command, /WD_WIN=\$\(\s*wslpath -w /);
+    assert.match(command, /node\.exe -e /);
+    assert.match(command, /\| node\.exe "\$CCW_WIN" cli/);
+    assert.match(command, / --cd "\$WD_WIN"/);
+    assert.match(command, / --tool claude\b/);
+    assert.match(command, / --mode analysis\b/);
+    assert.match(command, / --id exec-1\b/);
+    assert.ok(!command.includes('--no-native'));
+  });
+});