feat: add dynamic pipeline detection for team sessions v5 architecture

Backend:
- Fix readLegacyFiles to handle { name, prefix }[] role format
- Add roles backfill in getEffectiveTeamMeta when meta.json exists
- Ensure pipeline_stages and roles flow correctly to API response

Team Skills:
- Add pipeline metadata initialization to all 16 team skill coordinator roles
- Each skill now reports pipeline_stages and roles to meta.json at session init

Documentation:
- Update command references and component documentation
- Add numerical-analysis-workflow skill spec
- Sync zh/en translations for commands and components

.claude/skills/team-frontend/roles/coordinator/role.md

@@ -161,10 +161,22 @@ Bash("mkdir -p .workflow/.team/FE-<slug>-<YYYY-MM-DD>/{.msg,wisdom,analysis,arch
 }
 ```
 
-3. Initialize .msg/meta.json:
-
-```
-Write("<session>/.msg/meta.json", { "session_id": "<session-id>", "requirement": "<requirement>", "pipeline_mode": "<mode>" })
+3. Initialize meta.json with pipeline metadata:
+```typescript
+// Use team_msg to write pipeline metadata to .msg/meta.json
+mcp__ccw-tools__team_msg({
+  operation: "log",
+  session_id: "<session-id>",
+  from: "coordinator",
+  type: "state_update",
+  summary: "Session initialized",
+  data: {
+    pipeline_mode: "<page|feature|system>",
+    pipeline_stages: ["analyst", "architect", "developer", "qa"],
+    roles: ["coordinator", "analyst", "architect", "developer", "qa"],
+    team_name: "frontend"
+  }
+})
 ```
 
 4. Create team: