Add document standards, quality gates, and templates for team lifecycle phases

- Introduced `document-standards.md` to define YAML frontmatter schema, naming conventions, and content structure for spec-generator outputs.
- Created `quality-gates.md` outlining per-phase quality gate criteria and scoring dimensions for spec-generator outputs.
- Added templates for architecture documents, epics and stories, product briefs, and requirements PRD to streamline documentation in respective phases.

.claude/skills/team-frontend/role-specs/analyst.md

@@ -1,7 +1,7 @@
 ---
 prefix: ANALYZE
 inner_loop: false
-subagents: []
+additional_members: []
 message_types:
   success: analyze_ready
   error: error

.claude/skills/team-frontend/role-specs/architect.md

@@ -1,7 +1,7 @@
 ---
 prefix: ARCH
 inner_loop: false
-subagents: []
+additional_members: []
 message_types:
   success: arch_ready
   error: error

.claude/skills/team-frontend/role-specs/developer.md

@@ -1,7 +1,7 @@
 ---
 prefix: DEV
 inner_loop: true
-subagents: []
+additional_members: []
 message_types:
   success: dev_complete
   error: error

.claude/skills/team-frontend/role-specs/qa.md

@@ -1,7 +1,7 @@
 ---
 prefix: QA
 inner_loop: false
-subagents: []
+additional_members: []
 message_types:
   success: qa_passed
   error: error