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/github.com/jackc/pgx/v5/values.go

@@ -0,0 +1,68 @@
+package pgx
+
+import (
+	"errors"
+
+	"github.com/jackc/pgx/v5/internal/anynil"
+	"github.com/jackc/pgx/v5/internal/pgio"
+	"github.com/jackc/pgx/v5/pgtype"
+)
+
+// PostgreSQL format codes
+const (
+	TextFormatCode   = 0
+	BinaryFormatCode = 1
+)
+
+func convertSimpleArgument(m *pgtype.Map, arg any) (any, error) {
+	if anynil.Is(arg) {
+		return nil, nil
+	}
+
+	buf, err := m.Encode(0, TextFormatCode, arg, []byte{})
+	if err != nil {
+		return nil, err
+	}
+	if buf == nil {
+		return nil, nil
+	}
+	return string(buf), nil
+}
+
+func encodeCopyValue(m *pgtype.Map, buf []byte, oid uint32, arg any) ([]byte, error) {
+	if anynil.Is(arg) {
+		return pgio.AppendInt32(buf, -1), nil
+	}
+
+	sp := len(buf)
+	buf = pgio.AppendInt32(buf, -1)
+	argBuf, err := m.Encode(oid, BinaryFormatCode, arg, buf)
+	if err != nil {
+		if argBuf2, err2 := tryScanStringCopyValueThenEncode(m, buf, oid, arg); err2 == nil {
+			argBuf = argBuf2
+		} else {
+			return nil, err
+		}
+	}
+
+	if argBuf != nil {
+		buf = argBuf
+		pgio.SetInt32(buf[sp:], int32(len(buf[sp:])-4))
+	}
+	return buf, nil
+}
+
+func tryScanStringCopyValueThenEncode(m *pgtype.Map, buf []byte, oid uint32, arg any) ([]byte, error) {
+	s, ok := arg.(string)
+	if !ok {
+		return nil, errors.New("not a string")
+	}
+
+	var v any
+	err := m.Scan(oid, TextFormatCode, []byte(s), &v)
+	if err != nil {
+		return nil, err
+	}
+
+	return m.Encode(oid, BinaryFormatCode, v, buf)
+}