System overview design: four-model audit, repair, and regression complete

- system-overview-design.md: repaired with P0/P1/P2 gaps resolved, all 24 frozen baselines listed, error taxonomy, global ~/.air, IPC, TaskSpec/WorkerResult, PromptLayer, PermissionEngine, RuntimeEvent, state machines, capability trust, artifact naming, operations
- Four cross-verification audit reports (GPT-5, MIMO 2.5, Opus 4.7, DeepSeek V4 Pro)
- Three regression reviews (R1: initial repair closure, R2: second pass with PromptLayer L9 wording found, R3: full PromptLayer alignment verified)
- AGENTS.md, plan.md, todo.md synchronized

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

AirPlan/AGENTS.md

@@ -13,6 +13,14 @@
 2. Load and maintain:
    - `AirPlan/docs/analysis/requirements.md`
    - `AirPlan/docs/architecture/solution-architecture.md`
+   - `AirPlan/docs/architecture/system-overview-design.md`
+   - `AirPlan/docs/architecture/gpt5概要设计审查.md`
+   - `AirPlan/docs/architecture/mimo2.5概要设计审查.md`
+   - `AirPlan/docs/architecture/Opus4.7概要设计审查.md`
+   - `AirPlan/docs/architecture/DeepSeek概要设计审查.md`
+   - `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/baselineV1.md`
    - `AirPlan/docs/architecture/db-schema-v1.md`
    - `AirPlan/docs/architecture/event-registry-v1.md`