vault: align ECC docs with current repo and add orchestration manual

Updated ECC notes to match the current state of affaan-m/everything-claude-code
docs/token-optimization.md and docs/SKILL-PLACEMENT-POLICY.md:

- Drop CLAUDE_AUTOCOMPACT_PCT_OVERRIDE recommendations (now warned against
  upstream — variable can only lower threshold, opposite of intent)
- Add CLAUDE_CODE_SUBAGENT_MODEL=haiku as the new core token-saving setting
- Flag the default `memory` MCP for disablement (no skill/agent/hook references)
- Add Skill Placement Policy section (curated/learned/imported/evolved + provenance)
- Cover missing commands: /checkpoint, /sessions, /security-scan, /claw, /projects

Add new resource: ECC 编排实战手册.md (721 lines). Six orchestration patterns
(dmux+worktree, sequential claude -p, continuous-claude, Ralphinho RFC-DAG,
santa-loop, Task in-process) with real commands, real plan.json structures,
real CLI flags, and explicit "could not verify online" markers for /multi-*
and /feature-dev. All sourced to specific commands/*.md or skills/*.md files.

Cross-link the new manual from 完整指南 and 用法速查.

6 - Zettelkasten/20260308213000 Everything Claude Code 最佳实践.md

@@ -20,9 +20,13 @@ source: "https://github.com/affaan-m/everything-claude-code"
 90% 任务用 Sonnet，只在架构决策和安全分析时用 Opus，搜索探索用 Haiku。设置：
 
 ```json
-{ "model": "sonnet", "env": { "MAX_THINKING_TOKENS": "10000", "CLAUDE_AUTOCOMPACT_PCT_OVERRIDE": "50" } }
+{ "model": "sonnet", "env": { "MAX_THINKING_TOKENS": "10000", "CLAUDE_CODE_SUBAGENT_MODEL": "haiku" } }
 ```
 
+`CLAUDE_CODE_SUBAGENT_MODEL=haiku` 是省钱新核心 —— 子 agent(通过 Task 工具派发的)跑 Haiku，比默认便宜约 80%，文件读取/探索质量基本无损。
+
+> ⚠️ **不要再设 `CLAUDE_AUTOCOMPACT_PCT_OVERRIDE`**。仓库 `docs/token-optimization.md` 已警告：该变量在新版 Claude Code 上只能"降低阈值"(让压缩更早触发)，与延后压缩的目的相反。改用手动 `/compact` + `strategic-compact` skill。
+
 用 mgrep 替代 grep 可减少约 50% token 使用。
 
 ## 记忆持久化