[2.33.1] Add status frontmatter to plan templates

- Plan templates now include `status: active` in YAML frontmatter
- /workflows:work updates plan status to `completed` after shipping
- Agents can grep frontmatter to distinguish current vs historical plans

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

plugins/compound-engineering/commands/workflows/plan.md

@@ -178,6 +178,7 @@ Select how comprehensive you want the issue to be, simpler is mostly better.
 ---
 title: [Issue Title]
 type: [feat|fix|refactor]
+status: active
 date: YYYY-MM-DD
 ---
 
@@ -230,6 +231,7 @@ end
 ---
 title: [Issue Title]
 type: [feat|fix|refactor]
+status: active
 date: YYYY-MM-DD
 ---
 
@@ -294,6 +296,7 @@ date: YYYY-MM-DD
 ---
 title: [Issue Title]
 type: [feat|fix|refactor]
+status: active
 date: YYYY-MM-DD
 ---