添加brainstorm工作流与插件元数据

standards/design-docs.md

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+---
+paths:
+  - "design/gdd/**"
+---
+
+# Design Document Rules
+
+- Every design document MUST contain these 8 sections: Overview, Player Fantasy, Detailed Rules, Formulas, Edge Cases, Dependencies, Tuning Knobs, Acceptance Criteria
+- Formulas must include variable definitions, expected value ranges, and example calculations
+- Edge cases must explicitly state what happens, not just "handle gracefully"
+- Dependencies must be bidirectional — if system A depends on B, B's doc must mention A
+- Tuning knobs must specify safe ranges and what gameplay aspect they affect
+- Acceptance criteria must be testable — a QA tester must be able to verify pass/fail
+- No hand-waving: "the system should feel good" is not a valid specification
+- Balance values must link to their source formula or rationale
+- Design documents MUST be written incrementally: create skeleton first, then fill
+  each section one at a time with user approval between sections. Write each
+  approved section to the file immediately to persist decisions and manage context