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-tech-debt/role-specs/validator.md

@@ -58,8 +58,18 @@ Execute 4-layer validation (all commands in worktree):
 - improvement_percentage = ((before - after) / before) * 100
 
 **Auto-fix attempt** (when total_regressions <= 3):
-- Spawn code-developer subagent to fix regressions in worktree
-- Constraints: fix only regressions, preserve debt cleanup changes, no suppressions
+- Use CLI tool to fix regressions in worktree:
+  ```
+  Bash({
+    command: `cd "${worktreePath}" && ccw cli -p "PURPOSE: Fix regressions found in validation
+  TASK: ${regressionDetails}
+  MODE: write
+  CONTEXT: @${modifiedFiles.join(' @')}
+  EXPECTED: Fixed regressions
+  CONSTRAINTS: Fix only regressions | Preserve debt cleanup changes | No suppressions" --tool gemini --mode write`,
+    run_in_background: false
+  })
+  ```
 - Re-run checks after fix attempt
 
 ## Phase 4: Compare & Report