[Draft] feat(prompt-preset): add delegation + skill gates to deepseek-v4 and kimi-k3 (canary measuring)

[grim-susemi]

Draft — canary measuring, ready on M1-M4

본 PR은 **카나리아(개인 확장 omo-subagent-skill-correction)**가 행동 게이트를 통과하면 ready로 전환됩니다.

• 배경: GPT 프리셋에는 DELEGATION 등 위임 규칙이 있으나 DeepSeek V4(3종)와 K3에는 없어, K3 위임률 0.21%(1/470), DeepSeek 첫 위임 62.3메시지, SKILL.md 0회 read로 관측됨 (.omo/plans/omo-model-presets-deepseek-k3.md Findings).
• 변경:
  • deepseek-v4.ts 5→7 rules: delegate-separable-work + load-matching-skills (ALL_PRESETS, 4규칙 중 2)
  • kimi-k3.ts core Working the Task에 위임 1회 결정 + 스킬 terminal gate 2문단 추가 (canary Appendix A verbatim)
• 테스트: prompt-presets-deepseek-v4 66/66, prompt-presets-kimi-k3 포함 — 기존 canary 규칙 id와 동일(deepseek-v4.delegate-separable-work 등), 구조 파싱만 (no pinned prose).
• 게이트: Appendix B — ≥20 자격 턴 또는 2주, M1 +10%p, M2 +10%p, M3 ≤+5%p, M4 ≤+2%p 통과 후 ready. 통과 전 머지 금지(G13).

Canary: ~/.omo/agent/extensions/omo-subagent-skill-correction.ts (DISABLED=false) — 같은 4규칙이 이 머신에서 이미 주입 중. 측정·리포트는 매일 09:00 Discord 수집수세미 채널.

Related: .omo/plans/omo-model-presets-deepseek-k3.md, .omo/scripts/omo-subagent-skill-correction.mjs

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Summary by cubic

Adds delegation and visible-skill gates to DeepSeek V4 and Kimi K3 presets to address under-delegation and missed SKILL.md usage. Previously these presets kept work local and skipped the skill scan; now they partition work at intake, batch separable task calls, and enforce a terminal visible-skill scan that loads matching skills and passes load_skills when delegating.

Review and rollout

• Changes are limited to packages/coding-agent/src/core/extensions/builtin/prompt-preset/deepseek-v4.ts, packages/coding-agent/src/core/extensions/builtin/prompt-preset/kimi-k3.ts; packages/coding-agent/CHANGELOG.md adds a fix note.
• DeepSeek V4 adds rule IDs: delegate-separable-work, load-matching-skills (ALL_PRESETS). Kimi K3 adds two paragraphs under “Working the Task” for delegation-at-intake and the terminal visible-skill gate.
• Tests pass (66/66). Verify each preset renders the new rules exactly once and that no non-rule prose is pinned.
• Canary measuring only. Hold promotion until gates pass: ≥20 qualified turns or 2 weeks, with M1 +10pp, M2 +10pp, M3 ≤+5pp, M4 ≤+2pp vs baseline.

^{Written for commit 50b882e. Summary will update on new commits.}