feat: FT207 collections — namedtuple / defaultdict / Counter / deque#575
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…loses #574) - namedtuple: Point / RGB 軽量 Value Object（API 境界は dataclass で型安全に） - defaultdict: 単語頻度集計・先頭文字グループ化（返却は dict 変換を徹底） - Counter: 文字頻度集計・差分計算（- 演算は 0 以下除去を確認） - deque: 双方向キュー操作・固定容量リングバッファ（maxlen 上限 10000 設定） - セキュリティ診断合格（207 % 3 = 0): 全入力制限・インジェクションなし - 29 tests passed / mypy strict / ruff clean Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
namedtuple: Point / RGB 軽量 Value Object — API 境界はdataclass(frozen=True, slots=True)で型安全にdefaultdict: 単語頻度集計 / 先頭文字グループ化 — 返却は必ずdict(...)に変換Counter: 文字頻度集計 / 差分計算 —-演算は 0 以下を自動除去（subtract()との違い確認）deque: 双方向キュー操作 / 固定容量リングバッファ —maxlen上限 10,000 設定max_length制限・外部リソースアクセスなしCloses #574
Test plan
uv run pytest— 29 passed in sandboxuv run mypy— no issuesuv run ruff check/ruff format --check— all passed🤖 Generated with Claude Code