docs: actualizar README de issues — marcar 0029, 0033, 0035 como completados

Tambien resuelve conflicto de test helper newTestAgent entre
runtime_test.go (issue 0029) y commands_metrics_test.go (issue 0035)
renombrando el segundo a newMetricsTestAgent.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

agents/commands_metrics_test.go

@@ -15,9 +15,9 @@ import (
 	"log/slog"
 )
 
-// newTestAgent creates a minimal Agent for testing commands.
+// newMetricsTestAgent creates a minimal Agent for testing the !metrics command.
 // Does NOT connect to Matrix or LLM.
-func newTestAgent(logDir string) *Agent {
+func newMetricsTestAgent(logDir string) *Agent {
 	cfg := &config.AgentConfig{
 		Agent: config.AgentMeta{
 			ID:   "test-bot",
@@ -36,7 +36,7 @@ func newTestAgent(logDir string) *Agent {
 }
 
 func TestCmdMetrics_NoLogDir(t *testing.T) {
-	a := newTestAgent("")
+	a := newMetricsTestAgent("")
 	result := a.cmdMetrics(context.Background(), decision.MessageContext{})
 	if !strings.Contains(result, "no configurado") {
 		t.Errorf("expected 'no configurado' message, got: %s", result)
@@ -49,7 +49,7 @@ func TestCmdMetrics_NoLogsToday(t *testing.T) {
 	agentDir := filepath.Join(dir, "test-bot")
 	os.MkdirAll(agentDir, 0o755)
 
-	a := newTestAgent(dir)
+	a := newMetricsTestAgent(dir)
 	result := a.cmdMetrics(context.Background(), decision.MessageContext{})
 	if !strings.Contains(result, "No hay logs") {
 		t.Errorf("expected 'No hay logs' message, got: %s", result)
@@ -81,7 +81,7 @@ func TestCmdMetrics_AggregatesCorrectly(t *testing.T) {
 		t.Fatalf("WriteFile: %v", err)
 	}
 
-	a := newTestAgent(dir)
+	a := newMetricsTestAgent(dir)
 	result := a.cmdMetrics(context.Background(), decision.MessageContext{})
 
 	// Verify the output contains expected metrics
@@ -119,7 +119,7 @@ func TestCmdMetrics_LLMLatencyAverage(t *testing.T) {
 	content := strings.Join(lines, "\n") + "\n"
 	os.WriteFile(logFile, []byte(content), 0o644)
 
-	a := newTestAgent(dir)
+	a := newMetricsTestAgent(dir)
 	result := a.cmdMetrics(context.Background(), decision.MessageContext{})
 
 	// Average of 400 and 600 = 500