fix: clean up command templates (specify, analyze) (#1810)

* fix: clean up command templates (specify, analyze)

- specify.md: fix self-referential step number (step 6c → proceed to step 7)
- specify.md: remove empty "General Guidelines" heading before "Quick Guidelines"
- analyze.md: deduplicate {ARGS} — already present in "User Input" section at top

* fix: restore ## Context heading in analyze template

Address PR review feedback from @dhilipkumars: keep the ## Context
markdown heading to preserve structural hierarchy for LLM parsing.

templates/commands/specify.md

@@ -129,7 +129,7 @@ Given that feature description, do this:
 
    c. **Handle Validation Results**:
 
-      - **If all items pass**: Mark checklist complete and proceed to step 6
+      - **If all items pass**: Mark checklist complete and proceed to step 7
 
       - **If items fail (excluding [NEEDS CLARIFICATION])**:
         1. List the failing items and specific issues
@@ -178,8 +178,6 @@ Given that feature description, do this:
 
 **NOTE:** The script creates and checks out the new branch and initializes the spec file before writing.
 
-## General Guidelines
-
 ## Quick Guidelines
 
 - Focus on **WHAT** users need and **WHY**.