feat: add GitHub repo finder agent for create-app workflow
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GitHubRepoFinderRunner agent (cortex/agents/github_repo_finder/) that discovers REST API endpoints directly from a GitHub repository's source codegithub_repo_url optional field to CreateAppWorkflowConfig — when set, the create-app workflow uses the new agent instead of the standard ActionFinderRunnerBatchActionFinderResponse so the rest of the pipeline (curl-tester → action-builder → test-and-fix) works unchangedmake fmt && make chk — pyrefly passes, no new ruff errors{"app_name": "fineract", "github_repo_url": "https://github.com/apache/fineract", "force_run": true} to verify end-to-end discoverygithub_repo_url to verify existing ActionFinder path is unaffected🤖 Generated with Claude Code