feat: Production readiness improvements for WHOOSH council formation

Major security, observability, and configuration improvements:

## Security Hardening
- Implemented configurable CORS (no more wildcards)
- Added comprehensive auth middleware for admin endpoints
- Enhanced webhook HMAC validation
- Added input validation and rate limiting
- Security headers and CSP policies

## Configuration Management
- Made N8N webhook URL configurable (WHOOSH_N8N_BASE_URL)
- Replaced all hardcoded endpoints with environment variables
- Added feature flags for LLM vs heuristic composition
- Gitea fetch hardening with EAGER_FILTER and FULL_RESCAN options

## API Completeness
- Implemented GetCouncilComposition function
- Added GET /api/v1/councils/{id} endpoint
- Council artifacts API (POST/GET /api/v1/councils/{id}/artifacts)
- /admin/health/details endpoint with component status
- Database lookup for repository URLs (no hardcoded fallbacks)

## Observability & Performance
- Added OpenTelemetry distributed tracing with goal/pulse correlation
- Performance optimization database indexes
- Comprehensive health monitoring
- Enhanced logging and error handling

## Infrastructure
- Production-ready P2P discovery (replaces mock implementation)
- Removed unused Redis configuration
- Enhanced Docker Swarm integration
- Added migration files for performance indexes

## Code Quality
- Comprehensive input validation
- Graceful error handling and failsafe fallbacks
- Backwards compatibility maintained
- Following security best practices

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

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

vendor/go.opentelemetry.io/otel/exporters/jaeger/env.go

@@ -0,0 +1,44 @@
+// Copyright The OpenTelemetry Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package jaeger // import "go.opentelemetry.io/otel/exporters/jaeger"
+
+import (
+	"os"
+)
+
+// Environment variable names.
+const (
+	// Hostname for the Jaeger agent, part of address where exporter sends spans
+	// i.e.	"localhost".
+	envAgentHost = "OTEL_EXPORTER_JAEGER_AGENT_HOST"
+	// Port for the Jaeger agent, part of address where exporter sends spans
+	// i.e. 6831.
+	envAgentPort = "OTEL_EXPORTER_JAEGER_AGENT_PORT"
+	// The HTTP endpoint for sending spans directly to a collector,
+	// i.e. http://jaeger-collector:14268/api/traces.
+	envEndpoint = "OTEL_EXPORTER_JAEGER_ENDPOINT"
+	// Username to send as part of "Basic" authentication to the collector endpoint.
+	envUser = "OTEL_EXPORTER_JAEGER_USER"
+	// Password to send as part of "Basic" authentication to the collector endpoint.
+	envPassword = "OTEL_EXPORTER_JAEGER_PASSWORD"
+)
+
+// envOr returns an env variable's value if it is exists or the default if not.
+func envOr(key, defaultValue string) string {
+	if v := os.Getenv(key); v != "" {
+		return v
+	}
+	return defaultValue
+}