docs: 보스 설계 문서와 Codex YAML 도구 추가

- 프로젝트 AGENTS 지침에 커밋 후 푸시 확인 규칙과 런타임 콘텐츠 에이전트 규칙을 보강
- 보스 설계 플레이북과 멀티플레이 보스 설계 철학 문서를 추가해 사람용 설계 기준을 정리
- Codex-Tools 디렉터리에 Markdown→YAML→검증 파이프라인 스크립트와 프롬프트, 스키마, 설정 파일을 추가

Codex-Tools/schemas/boss_schema_v1.yaml

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+# Boss YAML Schema v1
+# Authoring target for Codex-readable encounter data.
+
+boss:
+  metadata:
+    boss_id: "example_boss_id"
+    boss_name: "Example Boss"
+    stage: 1
+    expected_duration_sec: 600
+    entity_type: "single"  # single | boss_plus_adds | multi_boss | swarm
+
+  signature:
+    name: "Example Signature"
+    concept: >
+      One-sentence summary of the signature encounter concept.
+    player_problem: >
+      What players must solve.
+    expected_solution:
+      tank: []
+      support: []
+      dps: []
+    failure_result:
+      type: "major_damage"  # major_damage | wipe | mechanic_repeat | positioning_loss | other
+      description: "What happens on failure."
+
+  roles:
+    tank:
+      pressure_sources: []
+      failure_results: []
+      required_pressure: 1.0
+    support:
+      pressure_sources: []
+      failure_results: []
+      required_pressure: 1.0
+    dps:
+      pressure_sources: []
+      failure_results: []
+      required_pressure: 1.0
+
+  phases:
+    - phase_id: 1
+      name: "Learn"
+      duration_estimate_sec: 120
+      new_mechanics: []
+      role_pressure_multiplier:
+        tank: 1.0
+        support: 1.0
+        dps: 1.0
+
+  pressure:
+    sustained:
+      sources: []
+    burst:
+      mechanics: []
+    dodge_types_required: []
+
+  revive:
+    trigger_response:
+      enabled: true
+      reactions: []
+    revive_risk_level: "medium"  # low | medium | high
+
+  escalation:
+    enabled: true
+    escalation_interval_sec: 60
+    escalation_types: []
+
+  entities:
+    total_entities: 1
+    composition:
+      main_boss: 1
+    add_behavior:
+      role: "none"
+      respawn: false
+
+  difficulty:
+    expected_attempts: 3
+    primary_failure_causes: []
+    secondary_failure_causes: []
+    design_intent: >
+      Short note on what the fight is trying to test.
+