System detailed design: four-model cross-review complete

Add system-detailed-design.md (2033 lines, 23 sections) derived from
frozen baselines and overview. Complete four-model cross-review:
- DeepSeek: baseline coverage audit (PASS, 9.6/10)
- MIMO 2.5 Pro: internal consistency (PASS, 9.4/10)
- GPT-5.5 Pro: baseline conflict detection (Requires repair)
- Opus 4.8: validation + root cause analysis (CONDITIONAL PASS, 9.1/10)

Key findings requiring resolution before freeze:
- P1-01: Worker exit code semantic conflict (baselineV1 vs overview)
- P1-02: PromptLayerLevel enum vs L0-L9 layer name mismatch
- P1-03: EventStore.project() error handling undefined
- P1-04: PromptLayerLoader interface incomplete for 10 layers

Coverage verified: 100% contracts, events, DB schema, state machines.
Architecture validated: no circular dependencies, proper separation.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

AirPlan/AGENTS.md

@@ -21,6 +21,13 @@
    - `AirPlan/docs/architecture/概要设计修复回归审查.md`
    - `AirPlan/docs/architecture/概要设计修复回归审查-R2.md`
    - `AirPlan/docs/architecture/概要设计修复回归审查-R3.md`
+   - `AirPlan/docs/architecture/system-detailed-design.md`
+   - `AirPlan/docs/architecture/detailed-design-audit.md`
+   - `AirPlan/docs/architecture/DeepSeek系统详细设计审查.md`
+   - `AirPlan/docs/architecture/Mimo2.5pro系统详细设计审查.md`
+   - `AirPlan/docs/architecture/gpt5.5pro系统详细设计审查.md`
+   - `AirPlan/docs/architecture/opus4.8系统详细设计审查.md`
+   - `AirPlan/docs/architecture/多模型系统详细设计交叉审查汇总.md`
    - `AirPlan/docs/architecture/baselineV1.md`
    - `AirPlan/docs/architecture/db-schema-v1.md`
    - `AirPlan/docs/architecture/event-registry-v1.md`