Update deployment docs, complete Deployment Strategy epic

Rewrite DEPLOYMENT.md to reflect current state (CI/CD, backups, merge
strategy). Expand CI paths-ignore to skip docs, license, gitignore,
and deploy workflow changes. Add merge strategy to CLAUDE.md.

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

.github/workflows/ci.yml

@@ -5,10 +5,18 @@ on:
     branches: [develop]
     paths-ignore:
       - ".beans/**"
+      - "*.md"
+      - "LICENSE"
+      - ".gitignore"
+      - ".github/workflows/deploy.yml"
   pull_request:
     branches: [develop]
     paths-ignore:
       - ".beans/**"
+      - "*.md"
+      - "LICENSE"
+      - ".gitignore"
+      - ".github/workflows/deploy.yml"
 
 jobs:
   backend-lint: