docs(prompt-mgmt): 方案A 协同回写 + 补声明 structlog 依赖

- memory/contracts.md：立 C6-ext（load_prompt/SPECS/SCHEMA_CATALOG/
  REVIEW_RESERVED_NAMES/SpecResolver + 打包契约）+ 变更日志一笔
- memory/decisions.md：方案A 决策（运行时值金标准/尾换行方案B/守卫前移/
  schema 留 Python/同一实例）
- memory/gotchas.md：spec.name 连字符命名 / 改稿须重生成金标准 /
  .gitattributes 完整嵌套路径 / wheel artifacts 带 .md / structlog 补声明 /
  SpecResolver 零 DB + 精确匹配
- PROGRESS.md：已封板「Prompt 管理重构 + 全量重写」波次
- ARCHITECTURE.md §5.1：补 prompt 外置 + SPECS/SCHEMA_CATALOG/SpecResolver，
  内置 agent 计数 8→21
- packages/{llm_gateway,core}/pyproject.toml：补声明 structlog>=24.1
  （原直接 import 未声明，靠 apps/api 传递；裸装 import ww_agents 会缺）

packages/core/pyproject.toml

@@ -6,6 +6,7 @@ dependencies = [
   "langgraph>=0.2.40",
   "langgraph-checkpoint-postgres>=2.0",
   "pydantic>=2.7",
+  "structlog>=24.1",
   "ww-shared",
   "ww-config",
   "ww-db",

packages/llm_gateway/pyproject.toml

@@ -9,6 +9,7 @@ dependencies = [
   "instructor>=1.5",
   "pydantic>=2.7",
   "tenacity>=8.2",
+  "structlog>=24.1",
   "ww-shared",
   "ww-config",
   "ww-db",