Fix backlog item YAML frontmatter format

- Add missing github_issue field to all backlog items
- Fix dependencies field format to match template
- Ensure proper YAML frontmatter structure for VibeSafe integration

backlog/features/2025-08-15_design-modern-lfm-kernel.md

@@ -6,7 +6,8 @@ priority: "High"
 created: "2025-08-15"
 last_updated: "2025-08-15"
 owner: "Neil Lawrence"
-dependencies: ["lfm-kernel-code-review"]
+github_issue: ""
+dependencies: "lfm-kernel-code-review"
 tags:
 - lfm
 - kernel

backlog/features/2025-08-15_implement-lfm-kernel-core.md

@@ -6,7 +6,8 @@ priority: "High"
 created: "2025-08-15"
 last_updated: "2025-08-15"
 owner: "Neil Lawrence"
-dependencies: ["design-modern-lfm-kernel"]
+github_issue: ""
+dependencies: "design-modern-lfm-kernel"
 tags:
 - lfm
 - kernel

backlog/features/2025-08-15_lfm-kernel-code-review.md

@@ -6,7 +6,8 @@ priority: "High"
 created: "2025-08-15"
 last_updated: "2025-08-15"
 owner: "Neil Lawrence"
-dependencies: []
+github_issue: ""
+dependencies: ""
 tags:
 - lfm
 - kernel