docs: standardize Story Acceptance Testing naming conventions

- Rename folder: docs/template-development/testing/uat/ → stories/
- Rename 12 files: functional-test-plan-*.md → story-acceptance-test-*.md
- Update CLAUDE.md: Change "UAT Testing" to "Story Acceptance Testing"
- Update docs/testing/index.md: Fix all paths and terminology references
- Update file headers: "User Acceptance Testing (UAT) Plan" → "Story Acceptance Test"

Resolves naming inconsistency and aligns terminology with actual purpose:
end-of-story validation for template development context.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: klueless-io

CLAUDE.md

@@ -592,9 +592,9 @@ When asked about testing or testing-related documentation:
    - **Writing tests**: Use `testing-patterns.md`
    - **Setup/standards**: Reference `test-strategy-and-standards.md`
 
-2. **Functional/UAT Testing**: Only include UAT files from `docs/testing/uat/` when specifically requested for functional testing
+2. **Story Acceptance Testing**: Only include Story Acceptance Test files from `docs/template-development/testing/stories/` when specifically requested for story validation
 
-3. **Key principle**: Technical testing docs are for developers writing/debugging tests. UAT docs are for product validation. Don't mix contexts unless explicitly asked.
+3. **Key principle**: Technical testing docs are for developers writing/debugging tests. Story Acceptance Tests are for story completion validation. Don't mix contexts unless explicitly asked.
 
 ## File Creation Discovery Protocol
 

docs/template-development/testing/uat/functional-test-plan-1.2.md renamed to docs/template-development/testing/stories/story-acceptance-test-1.2.md

@@ -1,4 +1,4 @@
-# User Acceptance Testing (UAT) Plan
+# Story Acceptance Test
 
 ## Story 1.2: Basic Next.js App Shell
 

docs/template-development/testing/uat/functional-test-plan-1.4.md renamed to docs/template-development/testing/stories/story-acceptance-test-1.4.md

@@ -478,7 +478,7 @@
 
 ---
 
-**UAT Completion Date**: ****\_\_\_****  
-**Tested By**: ****\_\_\_****  
-**Approved By**: ****\_\_\_****  
-**Notes**: ****\_\_\_****
+**UAT Completion Date**: \***\*\_\_\_\*\***  
+**Tested By**: \***\*\_\_\_\*\***  
+**Approved By**: \***\*\_\_\_\*\***  
+**Notes**: \***\*\_\_\_\*\***