feat: add CLI fallback for MCP calls in team commands

- Implemented CLI fallback using `ccw team` for various team command operations in `execute.md`, `plan.md`, `review.md`, `spec-analyst.md`, `spec-coordinate.md`, `spec-discuss.md`, `spec-reviewer.md`, `spec-writer.md`, and `test.md`.
- Updated command generation templates to include CLI fallback examples.
- Enhanced validation checks to ensure CLI fallback sections are present.
- Added quality standards for CLI fallback in team command design.
- Introduced a new `GlobalGraphExpander` class for expanding search results with cross-directory relationships.
- Added tests for `GlobalGraphExpander` to verify functionality and score decay factors.

.claude/commands/team/spec-writer.md

@@ -55,6 +55,17 @@ mcp__ccw-tools__team_msg({ operation: "log", team: teamName, from: "spec-writer"
 mcp__ccw-tools__team_msg({ operation: "log", team: teamName, from: "spec-writer", to: "coordinator", type: "error", summary: "缺少 discovery-context.json, 无法生成 Product Brief" })
 ```
 
+### CLI 回退
+
+当 `mcp__ccw-tools__team_msg` MCP 不可用时，使用 `ccw team` CLI 作为等效回退：
+
+```javascript
+// 回退: 将 MCP 调用替换为 Bash CLI（参数一一对应）
+Bash(`ccw team log --team "${teamName}" --from "spec-writer" --to "coordinator" --type "draft_ready" --summary "Product Brief 完成: 8个章节" --ref "${sessionFolder}/product-brief.md" --json`)
+```
+
+**参数映射**: `team_msg(params)` → `ccw team log --team <team> --from spec-writer --to coordinator --type <type> --summary "<text>" [--ref <path>] [--data '<json>'] [--json]`
+
 ## Execution Process
 
 ```