feat: provider extensions and drop claude-code-router mode (#295)

* feat: add ReportOutputProvider for consumer-extended report artifacts

* fix: thread deliverablesSubdir through report assembly

* fix: produce structured report JSON on resume path

* fix: fail loud on structured report output provider errors

* feat: extend checkpoint provider and container DI for consumer-specific backends

* fix: pre-create .shannon overlay mount points on all platforms

* chore: drop claude-code-router mode

* fix: drop 'resets' keyword from spending-cap text patterns

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -120,8 +120,6 @@ body:
         - "Custom base URL (proxy/gateway)"
         - "AWS Bedrock"
         - "Google Vertex AI"
-        - "Router - OpenAI"
-        - "Router - OpenRouter"
     validations:
       required: true