takt/#209/update review history logs (#213)

* fix: callAiJudgeをプロバイダーシステム経由に変更（Codex対応）

callAiJudgeがinfra/claude/にハードコードされており、Codexプロバイダー使用時に
judge評価が動作しなかった。agents/ai-judge.tsに移動し、runAgent経由で
プロバイダーを正しく解決するように修正。

* takt: github-issue-209

CLAUDE.md

@@ -406,7 +406,7 @@ Key constraints:
 - **Ephemeral lifecycle**: Clone is created → task runs → auto-commit + push → clone is deleted. Branches are the single source of truth.
 - **Session isolation**: Claude Code sessions are stored per-cwd in `~/.claude/projects/{encoded-path}/`. Sessions from the main project cannot be resumed in a clone. The engine skips session resume when `cwd !== projectCwd`.
 - **No node_modules**: Clones only contain tracked files. `node_modules/` is absent.
-- **Dual cwd**: `cwd` = clone path (where agents run), `projectCwd` = project root. Reports write to `cwd/.takt/reports/` (clone) to prevent agents from discovering the main repository. Logs and session data write to `projectCwd`.
+- **Dual cwd**: `cwd` = clone path (where agents run), `projectCwd` = project root. Reports write to `cwd/.takt/runs/{slug}/reports/` (clone) to prevent agents from discovering the main repository. Logs and session data write to `projectCwd`.
 - **List**: Use `takt list` to list branches. Instruct action creates a temporary clone for the branch, executes, pushes, then removes the clone.
 
 ## Error Propagation
@@ -455,10 +455,10 @@ Debug logs are written to `.takt/logs/debug.log` (ndjson format). Log levels: `d
 - If persona file doesn't exist, the persona string is used as inline system prompt
 
 **Report directory structure:**
-- Report dirs are created at `.takt/reports/{timestamp}-{slug}/`
+- Report dirs are created at `.takt/runs/{timestamp}-{slug}/reports/`
 - Report files specified in `step.report` are written relative to report dir
 - Report dir path is available as `{report_dir}` variable in instruction templates
-- When `cwd !== projectCwd` (worktree execution), reports write to `cwd/.takt/reports/` (clone dir) to prevent agents from discovering the main repository path
+- When `cwd !== projectCwd` (worktree execution), reports write to `cwd/.takt/runs/{slug}/reports/` (clone dir) to prevent agents from discovering the main repository path
 
 **Session continuity across phases:**
 - Agent sessions persist across Phase 1 → Phase 2 → Phase 3 for context continuity
@@ -470,7 +470,7 @@ Debug logs are written to `.takt/logs/debug.log` (ndjson format). Log levels: `d
 - `git clone --shared` creates independent `.git` directory (not `git worktree`)
 - Clone cwd ≠ project cwd: agents work in clone, reports write to clone, logs write to project
 - Session resume is skipped when `cwd !== projectCwd` to avoid cross-directory contamination
-- Reports write to `cwd/.takt/reports/` (clone) to prevent agents from discovering the main repository path via instruction
+- Reports write to `cwd/.takt/runs/{slug}/reports/` (clone) to prevent agents from discovering the main repository path via instruction
 - Clones are ephemeral: created → task runs → auto-commit + push → deleted
 - Use `takt list` to manage task branches after clone deletion
 

src/__tests__/engine-test-helpers.test.ts

@@ -0,0 +1,21 @@
+import { describe, it, expect, vi } from 'vitest';
+
+import { cleanupPieceEngine } from './engine-test-helpers.js';
+
+describe('cleanupPieceEngine', () => {
+  it('should remove all listeners when engine has removeAllListeners function', () => {
+    const removeAllListeners = vi.fn();
+    const engine = { removeAllListeners };
+
+    cleanupPieceEngine(engine);
+
+    expect(removeAllListeners).toHaveBeenCalledOnce();
+  });
+
+  it('should not throw when engine does not have removeAllListeners function', () => {
+    expect(() => cleanupPieceEngine({})).not.toThrow();
+    expect(() => cleanupPieceEngine(null)).not.toThrow();
+    expect(() => cleanupPieceEngine(undefined)).not.toThrow();
+    expect(() => cleanupPieceEngine({ removeAllListeners: 'no-op' })).not.toThrow();
+  });
+});

src/__tests__/engine-test-helpers.ts

@@ -178,25 +178,27 @@ export function applyDefaultMocks(): void {
   vi.mocked(generateReportDir).mockReturnValue('test-report-dir');
 }
 
+type RemovableListeners = {
+  removeAllListeners: () => void;
+};
+
+function hasRemovableListeners(value: unknown): value is RemovableListeners {
+  if (!value || typeof value !== 'object') {
+    return false;
+  }
+  if (!('removeAllListeners' in value)) {
+    return false;
+  }
+  const candidate = value as { removeAllListeners: unknown };
+  return typeof candidate.removeAllListeners === 'function';
+}
+
 /**
  * Clean up PieceEngine instances to prevent EventEmitter memory leaks.
  * Call this in afterEach to ensure all event listeners are removed.
  */
-type ListenerCleanupTarget = {
-  removeAllListeners: () => void;
-};
-
-function isListenerCleanupTarget(value: unknown): value is ListenerCleanupTarget {
-  return (
-    typeof value === 'object' &&
-    value !== null &&
-    'removeAllListeners' in value &&
-    typeof value.removeAllListeners === 'function'
-  );
-}
-
 export function cleanupPieceEngine(engine: unknown): void {
-  if (isListenerCleanupTarget(engine)) {
+  if (hasRemovableListeners(engine)) {
     engine.removeAllListeners();
   }
 }

src/__tests__/instruction-helpers.test.ts

@@ -101,7 +101,7 @@ describe('renderReportOutputInstruction', () => {
     const result = renderReportOutputInstruction(step, ctx, 'en');
     expect(result).toContain('Report output');
     expect(result).toContain('Report File');
-    expect(result).toContain('Iteration 2');
+    expect(result).toContain('Move current content to `logs/reports-history/`');
   });
 
   it('should render English multi-file instruction', () => {
@@ -121,6 +121,7 @@ describe('renderReportOutputInstruction', () => {
     const result = renderReportOutputInstruction(step, ctx, 'ja');
     expect(result).toContain('レポート出力');
     expect(result).toContain('Report File');
+    expect(result).toContain('`logs/reports-history/`');
   });
 
   it('should render Japanese multi-file instruction', () => {

src/__tests__/instructionBuilder.test.ts

@@ -802,7 +802,7 @@ describe('instruction-builder', () => {
 
       expect(result).toContain('**Report output:** Output to the `Report File` specified above.');
       expect(result).toContain('- If file does not exist: Create new file');
-      expect(result).toContain('Append with `## Iteration 1` section');
+      expect(result).toContain('- If file exists: Move current content to `logs/reports-history/` and overwrite with latest report');
     });
 
     it('should include explicit order instead of auto-generated', () => {
@@ -833,14 +833,14 @@ describe('instruction-builder', () => {
       expect(result).toContain('# Plan');
     });
 
-    it('should replace {movement_iteration} in report output instruction', () => {
+    it('should include overwrite-and-archive rule in report output instruction', () => {
       const step = createMinimalStep('Do work');
       step.outputContracts = [{ name: '00-plan.md' }];
       const ctx = createReportContext({ movementIteration: 5 });
 
       const result = buildReportInstruction(step, ctx);
 
-      expect(result).toContain('Append with `## Iteration 5` section');
+      expect(result).toContain('Move current content to `logs/reports-history/` and overwrite with latest report');
     });
 
     it('should include instruction body text', () => {

src/__tests__/judgment-fallback.test.ts

@@ -3,8 +3,12 @@
  */
 
 import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { mkdtempSync, mkdirSync, rmSync, writeFileSync } from 'node:fs';
+import { join } from 'node:path';
+import { tmpdir } from 'node:os';
 import type { PieceMovement } from '../core/models/types.js';
 import type { JudgmentContext } from '../core/piece/judgment/FallbackStrategy.js';
+import { runAgent } from '../agents/runner.js';
 import {
   AutoSelectStrategy,
   ReportBasedStrategy,
@@ -88,6 +92,48 @@ describe('JudgmentStrategies', () => {
       // mockStep has no outputContracts field → getReportFiles returns []
       expect(strategy.canApply(mockContext)).toBe(false);
     });
+
+    it('should use only latest report file from reports directory', async () => {
+      const tmpRoot = mkdtempSync(join(tmpdir(), 'takt-judgment-report-'));
+      try {
+        const reportDir = join(tmpRoot, '.takt', 'runs', 'sample-run', 'reports');
+        const historyDir = join(tmpRoot, '.takt', 'runs', 'sample-run', 'logs', 'reports-history');
+        mkdirSync(reportDir, { recursive: true });
+        mkdirSync(historyDir, { recursive: true });
+
+        const latestFile = '05-architect-review.md';
+        writeFileSync(join(reportDir, latestFile), 'LATEST-ONLY-CONTENT');
+        writeFileSync(join(historyDir, '05-architect-review.20260210T061143Z.md'), 'OLD-HISTORY-CONTENT');
+
+        const stepWithOutputContracts: PieceMovement = {
+          ...mockStep,
+          outputContracts: [{ name: latestFile }],
+        };
+
+        const runAgentMock = vi.mocked(runAgent);
+        runAgentMock.mockResolvedValue({
+          persona: 'conductor',
+          status: 'done',
+          content: '[TEST-MOVEMENT:1]',
+          timestamp: new Date('2026-02-10T07:11:43Z'),
+        });
+
+        const strategy = new ReportBasedStrategy();
+        const result = await strategy.execute({
+          ...mockContext,
+          step: stepWithOutputContracts,
+          reportDir,
+        });
+
+        expect(result.success).toBe(true);
+        expect(runAgentMock).toHaveBeenCalledTimes(1);
+        const instruction = runAgentMock.mock.calls[0]?.[1];
+        expect(instruction).toContain('LATEST-ONLY-CONTENT');
+        expect(instruction).not.toContain('OLD-HISTORY-CONTENT');
+      } finally {
+        rmSync(tmpRoot, { recursive: true, force: true });
+      }
+    });
   });
 
   describe('ResponseBasedStrategy', () => {

src/__tests__/phase-runner-report-history.test.ts

@@ -0,0 +1,143 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+import { existsSync, mkdtempSync, readFileSync, readdirSync, rmSync } from 'node:fs';
+import { join } from 'node:path';
+import { tmpdir } from 'node:os';
+import { runReportPhase, type PhaseRunnerContext } from '../core/piece/phase-runner.js';
+import type { PieceMovement } from '../core/models/types.js';
+
+vi.mock('../agents/runner.js', () => ({
+  runAgent: vi.fn(),
+}));
+
+import { runAgent } from '../agents/runner.js';
+
+function createStep(fileName: string): PieceMovement {
+  return {
+    name: 'reviewers',
+    personaDisplayName: 'Reviewers',
+    instructionTemplate: 'review',
+    passPreviousResponse: false,
+    outputContracts: [{ name: fileName }],
+  };
+}
+
+function createContext(reportDir: string): PhaseRunnerContext {
+  let currentSessionId = 'session-1';
+  return {
+    cwd: reportDir,
+    reportDir,
+    getSessionId: (_persona: string) => currentSessionId,
+    buildResumeOptions: (
+      _step,
+      _sessionId,
+      _overrides,
+    ) => ({ cwd: reportDir }),
+    updatePersonaSession: (_persona, sessionId) => {
+      if (sessionId) {
+        currentSessionId = sessionId;
+      }
+    },
+  };
+}
+
+describe('runReportPhase report history behavior', () => {
+  let tmpRoot: string;
+
+  beforeEach(() => {
+    tmpRoot = mkdtempSync(join(tmpdir(), 'takt-report-history-'));
+    vi.resetAllMocks();
+  });
+
+  afterEach(() => {
+    vi.useRealTimers();
+    if (existsSync(tmpRoot)) {
+      rmSync(tmpRoot, { recursive: true, force: true });
+    }
+  });
+
+  it('should overwrite report file and archive previous content to reports-history', async () => {
+    // Given
+    const reportDir = join(tmpRoot, '.takt', 'runs', 'sample-run', 'reports');
+    const step = createStep('05-architect-review.md');
+    const ctx = createContext(reportDir);
+    const runAgentMock = vi.mocked(runAgent);
+    runAgentMock
+      .mockResolvedValueOnce({
+        persona: 'reviewers',
+        status: 'done',
+        content: 'First review result',
+        timestamp: new Date('2026-02-10T06:11:43Z'),
+        sessionId: 'session-2',
+      })
+      .mockResolvedValueOnce({
+        persona: 'reviewers',
+        status: 'done',
+        content: 'Second review result',
+        timestamp: new Date('2026-02-10T06:14:37Z'),
+        sessionId: 'session-3',
+      });
+
+    // When
+    await runReportPhase(step, 1, ctx);
+    await runReportPhase(step, 2, ctx);
+
+    // Then
+    const latestPath = join(reportDir, '05-architect-review.md');
+    const latestContent = readFileSync(latestPath, 'utf-8');
+    expect(latestContent).toBe('Second review result');
+
+    const historyDir = join(tmpRoot, '.takt', 'runs', 'sample-run', 'logs', 'reports-history');
+    const historyFiles = readdirSync(historyDir);
+    expect(historyFiles).toHaveLength(1);
+    expect(historyFiles[0]).toMatch(/^05-architect-review\.\d{8}T\d{6}Z\.md$/);
+
+    const archivedContent = readFileSync(join(historyDir, historyFiles[0]!), 'utf-8');
+    expect(archivedContent).toBe('First review result');
+  });
+
+  it('should add sequence suffix when history file name collides in the same second', async () => {
+    // Given
+    vi.useFakeTimers();
+    vi.setSystemTime(new Date('2026-02-10T06:11:43Z'));
+
+    const reportDir = join(tmpRoot, '.takt', 'runs', 'sample-run', 'reports');
+    const step = createStep('06-qa-review.md');
+    const ctx = createContext(reportDir);
+    const runAgentMock = vi.mocked(runAgent);
+    runAgentMock
+      .mockResolvedValueOnce({
+        persona: 'reviewers',
+        status: 'done',
+        content: 'v1',
+        timestamp: new Date('2026-02-10T06:11:43Z'),
+        sessionId: 'session-2',
+      })
+      .mockResolvedValueOnce({
+        persona: 'reviewers',
+        status: 'done',
+        content: 'v2',
+        timestamp: new Date('2026-02-10T06:11:43Z'),
+        sessionId: 'session-3',
+      })
+      .mockResolvedValueOnce({
+        persona: 'reviewers',
+        status: 'done',
+        content: 'v3',
+        timestamp: new Date('2026-02-10T06:11:43Z'),
+        sessionId: 'session-4',
+      });
+
+    // When
+    await runReportPhase(step, 1, ctx);
+    await runReportPhase(step, 2, ctx);
+    await runReportPhase(step, 3, ctx);
+
+    // Then
+    const historyDir = join(tmpRoot, '.takt', 'runs', 'sample-run', 'logs', 'reports-history');
+    const historyFiles = readdirSync(historyDir).sort();
+    expect(historyFiles).toEqual([
+      '06-qa-review.20260210T061143Z.1.md',
+      '06-qa-review.20260210T061143Z.md',
+    ]);
+  });
+});

src/core/piece/instruction/InstructionBuilder.ts

@@ -298,21 +298,21 @@ export function renderReportOutputInstruction(
 
   let heading: string;
   let createRule: string;
-  let appendRule: string;
+  let overwriteRule: string;
 
   if (language === 'ja') {
     heading = isMulti
       ? '**レポート出力:** Report Files に出力してください。'
       : '**レポート出力:** `Report File` に出力してください。';
     createRule = '- ファイルが存在しない場合: 新規作成';
-    appendRule = `- ファイルが存在する場合: \`## Iteration ${context.movementIteration}\` セクションを追記`;
+    overwriteRule = '- ファイルが存在する場合: 既存内容を `logs/reports-history/` に退避し、最新内容で上書き';
   } else {
     heading = isMulti
       ? '**Report output:** Output to the `Report Files` specified above.'
       : '**Report output:** Output to the `Report File` specified above.';
     createRule = '- If file does not exist: Create new file';
-    appendRule = `- If file exists: Append with \`## Iteration ${context.movementIteration}\` section`;
+    overwriteRule = '- If file exists: Move current content to `logs/reports-history/` and overwrite with latest report';
   }
 
-  return `${heading}\n${createRule}\n${appendRule}`;
+  return `${heading}\n${createRule}\n${overwriteRule}`;
 }

src/core/piece/phase-runner.ts

@@ -5,8 +5,8 @@
  * as session-resume operations.
  */
 
-import { appendFileSync, existsSync, mkdirSync, writeFileSync } from 'node:fs';
+import { existsSync, mkdirSync, readFileSync, writeFileSync } from 'node:fs';
-import { dirname, resolve, sep } from 'node:path';
+import { dirname, parse, resolve, sep } from 'node:path';
 import type { PieceMovement, Language } from '../models/types.js';
 import type { PhaseName } from './types.js';
 import { runAgent, type RunAgentOptions } from '../../agents/runner.js';
@@ -49,6 +49,41 @@ export function needsStatusJudgmentPhase(step: PieceMovement): boolean {
   return hasTagBasedRules(step);
 }
 
+function formatHistoryTimestamp(date: Date): string {
+  const year = date.getUTCFullYear();
+  const month = String(date.getUTCMonth() + 1).padStart(2, '0');
+  const day = String(date.getUTCDate()).padStart(2, '0');
+  const hour = String(date.getUTCHours()).padStart(2, '0');
+  const minute = String(date.getUTCMinutes()).padStart(2, '0');
+  const second = String(date.getUTCSeconds()).padStart(2, '0');
+  return `${year}${month}${day}T${hour}${minute}${second}Z`;
+}
+
+function buildHistoryFileName(fileName: string, timestamp: string, sequence: number): string {
+  const parsed = parse(fileName);
+  const duplicateSuffix = sequence === 0 ? '' : `.${sequence}`;
+  return `${parsed.name}.${timestamp}${duplicateSuffix}${parsed.ext}`;
+}
+
+function backupExistingReport(reportDir: string, fileName: string, targetPath: string): void {
+  if (!existsSync(targetPath)) {
+    return;
+  }
+
+  const currentContent = readFileSync(targetPath, 'utf-8');
+  const historyDir = resolve(reportDir, '..', 'logs', 'reports-history');
+  mkdirSync(historyDir, { recursive: true });
+
+  const timestamp = formatHistoryTimestamp(new Date());
+  let sequence = 0;
+  let historyPath = resolve(historyDir, buildHistoryFileName(fileName, timestamp, sequence));
+  while (existsSync(historyPath)) {
+    sequence += 1;
+    historyPath = resolve(historyDir, buildHistoryFileName(fileName, timestamp, sequence));
+  }
+
+  writeFileSync(historyPath, currentContent);
+}
 
 function writeReportFile(reportDir: string, fileName: string, content: string): void {
   const baseDir = resolve(reportDir);
@@ -58,11 +93,8 @@ function writeReportFile(reportDir: string, fileName: string, content: string):
     throw new Error(`Report file path escapes report directory: ${fileName}`);
   }
   mkdirSync(dirname(targetPath), { recursive: true });
-  if (existsSync(targetPath)) {
+  backupExistingReport(baseDir, fileName, targetPath);
-    appendFileSync(targetPath, `\n\n${content}`);
-  } else {
   writeFileSync(targetPath, content);
-  }
 }
 
 /**