chore: delete 106 unreachable *_system.gd and their parity tests

These files were loaded only by their own test_*_parity.gd and never by
the runtime (transitively checked, incl. client_phase_integration_system).
Removes 76 manifest implementation/evidence references across 18
contracts; contract docs get a note that conclusions based on them are
void. Live systems kept: chest, consumable, item_attr, metin_socket,
whisper_chat.

Full headless suite: no new failures (7 failing + 5 headless-hanging
render tests are identical before the deletion).

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

audit/remediation-roadmap.md

@@ -15,7 +15,7 @@ python3 .agents/skills/metin2-40250-parity-audit/scripts/port_map.py queue --lim
 | 批次 | 内容 | 状态 |
 | --- | --- | --- |
 | 0 | 工具：参考根解析、缺失文件报错、`port_map.py`、构建/测试入口 | 完成 2026-09-22 |
-| 1 | 删除只被自身测试引用的 `project/*_system.gd` 与其 `test_*_parity.gd`，清除 manifest 中对应证据 | 待确认删除清单 |
+| 1 | 删除只被自身测试引用的 `project/*_system.gd` 与其 `test_*_parity.gd`，清除 manifest 中对应证据 | 完成 2026-09-22（106+106 个文件） |
 | 2 | P0 角色/移动单元（并行 worktree） | 未开始 |
 | 3 | P1 战斗/技能 → P2 游戏阶段封包 → P3 物品与 Python UI | 未开始 |
 | 4 | `NEEDS_LIVE` 真服验证批 | 未开始 |