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/digamma.go

@@ -0,0 +1,45 @@
+// Copyright ©2016 The Gonum Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package mathext
+
+import (
+	"math"
+)
+
+// Digamma returns the logorithmic derivative of the gamma function at x.
+//
+//	ψ(x) = d/dx (Ln (Γ(x)).
+func Digamma(x float64) float64 {
+	// This is adapted from
+	// http://web.science.mq.edu.au/~mjohnson/code/digamma.c
+	var result float64
+	switch {
+	case math.IsNaN(x), math.IsInf(x, 1):
+		return x
+	case math.IsInf(x, -1):
+		return math.NaN()
+	case x == 0:
+		return math.Copysign(math.Inf(1), -x)
+	case x < 0:
+		if x == math.Floor(x) {
+			return math.NaN()
+		}
+		// Reflection formula, http://dlmf.nist.gov/5.5#E4
+		_, r := math.Modf(x)
+		result = -math.Pi / math.Tan(math.Pi*r)
+		x = 1 - x
+	}
+	for ; x < 7; x++ {
+		// Recurrence relation, http://dlmf.nist.gov/5.5#E2
+		result -= 1 / x
+	}
+	x -= 0.5
+	xx := 1 / x
+	xx2 := xx * xx
+	xx4 := xx2 * xx2
+	// Asymptotic expansion, http://dlmf.nist.gov/5.11#E2
+	result += math.Log(x) + (1.0/24.0)*xx2 - (7.0/960.0)*xx4 + (31.0/8064.0)*xx4*xx2 - (127.0/30720.0)*xx4*xx4
+	return result
+}