feat(channel): add Bubble Tea TUI chat interface and Matrix adapter stub

internal/channel/matrix.go

@@ -0,0 +1,33 @@
+package channel
+
+import (
+	"context"
+	"log/slog"
+
+	"git.db123.ir/db123/divacode/internal/agent"
+	"git.db123.ir/db123/divacode/internal/config"
+)
+
+type MatrixClient struct {
+	cfg   *config.Config
+	agent *agent.Agent
+}
+
+func NewMatrixClient(cfg *config.Config, a *agent.Agent) *MatrixClient {
+	return &MatrixClient{
+		cfg:   cfg,
+		agent: a,
+	}
+}
+
+func (mc *MatrixClient) Start(ctx context.Context) error {
+	if !mc.cfg.MatrixEnabled {
+		slog.Info("matrix channel disabled")
+		return nil
+	}
+	slog.Info("matrix client connecting",
+		"homeserver", mc.cfg.MatrixHomeserver,
+		"user", mc.cfg.MatrixUser,
+	)
+	return nil
+}