Follow up PR #265: refine chapters, diagrams, and add S20 (#283)

* feat: s01-s14 docs quality overhaul — tool pipeline, single-agent, knowledge & resilience

Rewrite code.py and README (zh/en/ja) for s01-s14, each chapter building
incrementally on the previous. Key fixes across chapters:

- s01-s04: agent loop, tool dispatch, permission pipeline, hooks
- s05-s08: todo write, subagent, skill loading, context compact
- s09-s11: memory system, system prompt assembly, error recovery
- s12-s14: task graph, background tasks, cron scheduler

All chapters CC source-verified. Code inherits fixes forward (PROMPT_SECTIONS,
json.dumps cache, real-state context, can_start dep protection, etc.).

* feat: s15-s19 docs quality overhaul — multi-agent platform: teams, protocols, autonomy, worktree, MCP tools

Rewrite code.py and README (zh/en/ja) for s15-s19, the multi-agent platform
chapters. Each chapter inherits all previous fixes and adds one mechanism:

- s15: agent teams (TeamCreate, teammate threads, shared task list)
- s16: team protocols (plan approval, shutdown handshake, consume_inbox)
- s17: autonomous agents (idle polling, auto-claim, consume_lead_inbox)
- s18: worktree isolation (git worktree, bind_task, cwd switching, safety)
- s19: MCP tools (MCPClient, normalize_mcp_name, assemble_tool_pool, no cache)

All appendix source code references verified against CC source. Config priority
corrected: claude.ai < plugin < user < project < local.

* fix: 5 regressions across s05-s19 — glob safety, todo validation, memory extraction, protocol types, dep crash

- s05-s09: glob results now filter with is_relative_to(WORKDIR) (inherited from s02)
- s06-s08: todo_write validates content/status required fields (inherited from s05)
- s09: extract_memories uses pre-compression snapshot instead of compacted messages
- s16: submit_plan docstring clarifies protocol-only (not code-level gate)
- s17-s19: match_response restores type mismatch validation (from s16)
- s17-s19: claim_task deps list handles missing dep files without crashing

* fix: s12 Todo V2 logic reversal, s14/s15 cron range validation, s18/s19 worktree name validation

- s12 README (zh/en/ja): fix Todo V2 direction — interactive defaults to Task,
  non-interactive/SDK defaults to TodoWrite. Fix env var name to
  CLAUDE_CODE_ENABLE_TASKS (not TODO_V2).
- s14/s15: add _validate_cron_field with per-field range checks (minute 0-59,
  hour 0-23, dom 1-31, month 1-12, dow 0-6), step > 0, range lo <= hi.
  Replace old try/except validation that only caught exceptions.
- s18/s19: add validate_worktree_name() to remove_worktree and keep_worktree,
  not just create_worktree.

* fix: align s16-s19 teaching tool consistency

* fix pr265 chapter diagrams

* Add comprehensive s20 harness chapter

* Fix chapter smoke test regressions

* Clarify README tutorial track transition

---------

Co-authored-by: Haoran <bill-billion@outlook.com>

s09_memory/images/memory-subsystems.ja.svg

@@ -0,0 +1,78 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 720 380" font-family="system-ui, -apple-system, sans-serif">
+  <defs>
+    <linearGradient id="header" x1="0" y1="0" x2="1" y2="0">
+      <stop offset="0%" stop-color="#1e3a5f"/><stop offset="100%" stop-color="#7c3aed"/>
+    </linearGradient>
+    <marker id="arrow" viewBox="0 0 10 10" refX="10" refY="5" markerWidth="6" markerHeight="6" orient="auto-start-reverse">
+      <path d="M 0 0 L 10 5 L 0 10 z" fill="#7c3aed"/>
+    </marker>
+  </defs>
+
+  <rect width="720" height="380" fill="#fafbfc" rx="8"/>
+  <rect x="0" y="0" width="720" height="38" fill="url(#header)" rx="8"/>
+  <rect x="0" y="30" width="720" height="8" fill="url(#header)"/>
+  <text x="360" y="25" fill="#fff" font-size="14" font-weight="700" text-anchor="middle">Memory System — ストレージ · 読み込み · 抽出 · 整理</text>
+
+  <!-- ストレージ -->
+  <rect x="40" y="58" width="145" height="80" rx="8" fill="#ede9fe" stroke="#7c3aed" stroke-width="2"/>
+  <text x="112" y="80" fill="#5b21b6" font-size="13" font-weight="700" text-anchor="middle">ストレージ</text>
+  <line x1="55" y1="90" x2="170" y2="90" stroke="#c4b5fd" stroke-width="0.5"/>
+  <text x="55" y="108" fill="#5b21b6" font-size="10">.memory/*.md ファイル</text>
+  <text x="55" y="124" fill="#5b21b6" font-size="10">MEMORY.md インデックス</text>
+
+  <line x1="190" y1="98" x2="218" y2="98" stroke="#7c3aed" stroke-width="1.5" marker-end="url(#arrow)"/>
+
+  <!-- 読み込み -->
+  <rect x="222" y="58" width="200" height="80" rx="8" fill="#ede9fe" stroke="#7c3aed" stroke-width="2"/>
+  <text x="322" y="80" fill="#5b21b6" font-size="13" font-weight="700" text-anchor="middle">読み込み</text>
+  <line x1="237" y1="90" x2="407" y2="90" stroke="#c4b5fd" stroke-width="0.5"/>
+  <text x="237" y="108" fill="#5b21b6" font-size="10">インデックスを SYSTEM に常駐</text>
+  <text x="237" y="124" fill="#5b21b6" font-size="10">LLM side-query でファイル選択</text>
+  <text x="237" y="134" fill="#a78bfa" font-size="9">≤ 5 件、失敗時はキーワードに降格</text>
+
+  <line x1="425" y1="98" x2="453" y2="98" stroke="#7c3aed" stroke-width="1.5" marker-end="url(#arrow)"/>
+
+  <!-- 抽出 -->
+  <rect x="457" y="58" width="130" height="80" rx="8" fill="#f3e8ff" stroke="#7c3aed" stroke-width="2"/>
+  <text x="522" y="80" fill="#5b21b6" font-size="13" font-weight="700" text-anchor="middle">抽出</text>
+  <line x1="472" y1="90" x2="572" y2="90" stroke="#c4b5fd" stroke-width="0.5"/>
+  <text x="472" y="108" fill="#5b21b6" font-size="10">毎ターン終了後にトリガー</text>
+  <text x="472" y="124" fill="#5b21b6" font-size="10">LLM が好み/制約を抽出</text>
+  <text x="472" y="134" fill="#a78bfa" font-size="9">既存を確認、重複回避</text>
+
+  <!-- 整理 -->
+  <rect x="600" y="58" width="100" height="80" rx="8" fill="#f5f3ff" stroke="#7c3aed" stroke-width="2"/>
+  <text x="650" y="80" fill="#5b21b6" font-size="13" font-weight="700" text-anchor="middle">整理</text>
+  <line x1="615" y1="90" x2="685" y2="90" stroke="#c4b5fd" stroke-width="0.5"/>
+  <text x="615" y="108" fill="#5b21b6" font-size="10">ファイル ≥ 10 でトリガー</text>
+  <text x="615" y="124" fill="#5b21b6" font-size="10">重複排除・統合・剪定</text>
+  <text x="615" y="134" fill="#a78bfa" font-size="9">CC: 3 層ゲート</text>
+
+  <!-- Memory Files -->
+  <rect x="40" y="180" width="660" height="36" rx="6" fill="#f8fafc" stroke="#94a3b8" stroke-width="1" stroke-dasharray="4,2"/>
+  <text x="370" y="203" fill="#475569" font-size="11" text-anchor="middle">.memory/ — MEMORY.md インデックス + *.md ファイル（YAML frontmatter: name / description / type）</text>
+
+  <!-- Arrow: ストレージ → Memory Files -->
+  <path d="M 112 138 L 112 174 Q 112 180 118 180" fill="none" stroke="#7c3aed" stroke-width="1.5" marker-end="url(#arrow)"/>
+  <text x="120" y="162" fill="#7c3aed" font-size="9">読み/書き</text>
+
+  <!-- Arrow: 抽出 → Memory Files -->
+  <path d="M 522 138 L 522 180" fill="none" stroke="#7c3aed" stroke-width="1.5" marker-end="url(#arrow)"/>
+  <text x="536" y="164" fill="#7c3aed" font-size="9">書き込み</text>
+
+  <!-- Arrow: 整理 → Memory Files -->
+  <path d="M 650 138 L 650 180" fill="none" stroke="#7c3aed" stroke-width="1.5" marker-end="url(#arrow)"/>
+  <text x="662" y="164" fill="#7c3aed" font-size="9">上書き</text>
+
+  <!-- 4 種類の記憶 -->
+  <rect x="40" y="240" width="660" height="40" rx="6" fill="#faf5ff" stroke="#c4b5fd" stroke-width="0.5"/>
+  <text x="60" y="260" fill="#5b21b6" font-size="10" font-weight="600">4 種類の記憶：</text>
+  <text x="148" y="260" fill="#475569" font-size="10">user（あなたは誰か）· feedback（どう作業するか）· project（何が起きているか）· reference（どこで探すか）</text>
+
+  <!-- CC ソースコード対照 -->
+  <rect x="40" y="296" width="660" height="72" rx="6" fill="#f8fafc" stroke="#e2e8f0" stroke-width="1"/>
+  <text x="60" y="316" fill="#5b21b6" font-size="11" font-weight="600">CC ソースコード対照</text>
+  <text x="60" y="334" fill="#475569" font-size="10">• 記憶選択：LLM side-query（Sonnet が選択）、embedding ベクトル類似度ではない</text>
+  <text x="60" y="350" fill="#475569" font-size="10">• 抽出タイミング：stop hook（毎ターン終了後）、autoCompact 後ではない</text>
+  <text x="60" y="366" fill="#475569" font-size="10">• Dream 整理：3 層ゲート（時間 ≥ 24h + セッション ≥ 5 + ファイルロック）、単純な計数ではない</text>
+</svg>