feat: pivot complete-unit-tests workflow to multi-phase coverage iteration

[Copilot]

CmdDatas/Commands tests are effectively complete (4 remaining: ABGMCmd, AIfCmd, ATalkCmd, FontCmd). The Agentic Workflow needed to shift focus to the next uncovered areas: Commands/ (~8,700 src lines, ~11% tested) and Intermissions/ (2,200 lines, 0% tested).

Changes to complete-unit-tests.md

• Description: Updated to describe a 3-phase coverage plan with no per-PR size limit — each run covers as much as possible
• Agent intro: Renamed to "カバレッジ補強エージェント", added explicit phase priority and instruction to maximize tests per run
• Step 1 (new): Phase detection logic — checks CmdDatas remaining → Commands/ gap → Intermissions/ gap in order
• Step 2–3: Per-phase instructions; Step 3 includes a prioritized file list for Commands/ (smaller/simpler files first, Command.attack.cs / Command.process.cs last due to GUI coupling); all uncovered files targeted in a single run
• Step 4: Phase 1 uses help docs as before; Phases 2–3 reference source code directly (no help files exist for these areas)
• Step 5: New test class patterns for Commands/ partial-class tests and Intermissions/, including MockGUI handler setup
• Step 6: Discrepancy policy adapted — source code is the spec for Phases 2–3, so only report ambiguity/untestable design issues
• Step 8: PR title format includes phase number; body includes per-phase coverage summary

Coverage gaps being targeted

Area	Source lines	Test lines	Coverage
CmdDatas/Commands/	13,821	13,287	✅ ~done
Commands/	8,691	978	⚠️ ~11%
Intermissions/	2,204	0	❌ 0%

[7474]

@copilot 1PRのサイズ制限を外して、1回の反復での対応量を重視するように見直してください。

[Copilot]

@copilot 1PRのサイズ制限を外して、1回の反復での対応量を重視するように見直してください。

6129feb にて対応しました。PR サイズ制限（1000行）を全箇所から削除し、「1回の実行でできるだけ多くのテストを追加する」方針に変更しました。