feat: initial release with 48 Mattermost MCP tools

- 27 base tools: channels, messaging, users, reactions, files, DMs
- Team management: invite/remove users, get stats, list members
- Slash commands: execute /remind, /poll, etc.
- Webhook management: incoming and outgoing webhooks
- System tools: server config, logs, bulk status updates
- Channel admin: create, invite, leave, delete channels
- Read-only mode for safe exploration
- Dual token support (bot + PAT) for enhanced security
- Apache 2.0 licensed

pkg/log/context.go

@@ -0,0 +1,85 @@
+package log
+
+import (
+	"context"
+	"fmt"
+	"sync"
+	"time"
+)
+
+type contextKey string
+
+const (
+	correlationIDKey contextKey = "correlation_id"
+	operationKey     contextKey = "operation"
+	startTimeKey     contextKey = "start_time"
+)
+
+var (
+	correlationIDGenerator = &idGenerator{}
+)
+
+type idGenerator struct {
+	mu  sync.Mutex
+	seq uint64
+}
+
+func (g *idGenerator) Generate() string {
+	g.mu.Lock()
+	defer g.mu.Unlock()
+	g.seq++
+	return time.Now().Format("20060102-150405") + "-" + fmt.Sprint(g.seq)
+}
+
+func WithCorrelationID(ctx context.Context, id string) context.Context {
+	if id == "" {
+		id = correlationIDGenerator.Generate()
+	}
+	return context.WithValue(ctx, correlationIDKey, id)
+}
+
+func WithOperation(ctx context.Context, operation string) context.Context {
+	return context.WithValue(ctx, operationKey, operation)
+}
+
+func WithStartTime(ctx context.Context) context.Context {
+	return context.WithValue(ctx, startTimeKey, time.Now())
+}
+
+func GetCorrelationID(ctx context.Context) string {
+	if ctx == nil {
+		return ""
+	}
+	if id, ok := ctx.Value(correlationIDKey).(string); ok {
+		return id
+	}
+	return ""
+}
+
+func GetOperation(ctx context.Context) string {
+	if ctx == nil {
+		return ""
+	}
+	if op, ok := ctx.Value(operationKey).(string); ok {
+		return op
+	}
+	return ""
+}
+
+func GetStartTime(ctx context.Context) time.Time {
+	if ctx == nil {
+		return time.Time{}
+	}
+	if t, ok := ctx.Value(startTimeKey).(time.Time); ok {
+		return t
+	}
+	return time.Time{}
+}
+
+func Duration(ctx context.Context) time.Duration {
+	start := GetStartTime(ctx)
+	if start.IsZero() {
+		return 0
+	}
+	return time.Since(start)
+}