Integrate BACKBEAT SDK and resolve KACHING license validation

Major integrations and fixes:
- Added BACKBEAT SDK integration for P2P operation timing
- Implemented beat-aware status tracking for distributed operations
- Added Docker secrets support for secure license management
- Resolved KACHING license validation via HTTPS/TLS
- Updated docker-compose configuration for clean stack deployment
- Disabled rollback policies to prevent deployment failures
- Added license credential storage (CHORUS-DEV-MULTI-001)

Technical improvements:
- BACKBEAT P2P operation tracking with phase management
- Enhanced configuration system with file-based secrets
- Improved error handling for license validation
- Clean separation of KACHING and CHORUS deployment stacks

🤖 Generated with [Claude Code](https://claude.ai/code)

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

vendor/gonum.org/v1/gonum/mathext/README.md

@@ -0,0 +1,6 @@
+# mathext
+
+[![go.dev reference](https://pkg.go.dev/badge/gonum.org/v1/gonum/mathext)](https://pkg.go.dev/gonum.org/v1/gonum/mathext)
+[![GoDoc](https://godocs.io/gonum.org/v1/gonum/mathext?status.svg)](https://godocs.io/gonum.org/v1/gonum/mathext)
+
+Package mathext implements basic elementary functions not included in the Go standard library.