fix(telemetry): resolve clang-tidy include and modernize-use-auto CI errors

- Replace unused observer_result.h with nostd/shared_ptr.h and
  nostd/unique_ptr.h in MetricsRegistry.h (misc-include-cleaner)
- Use auto for cast initializations in MetricsRegistry.cpp and
  ValidationTracker test (modernize-use-auto)
- Run rename scripts: rippled -> xrpld in comments and docs

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

OpenTelemetryPlan/Phase9_taskList.md

@@ -465,7 +465,7 @@ These metrics serve multiple external consumer categories identified during rese
 
 ### Purpose
 
-Phase 9 exports ~68 internal rippled metrics and ships Grafana dashboards for
+Phase 9 exports ~68 internal xrpld metrics and ships Grafana dashboards for
 them. This adds the missing operator-facing piece: **provisioned Grafana alert
 rules** that fire on the health-critical metrics phase 9 introduces. The
 phase-9 task list (line 311) and Jira story RIPD-5187 both already list

docs/telemetry-runbook.md

@@ -888,7 +888,7 @@ Requires `trace_peer=1` in the `[telemetry]` config section.
 
 ## Alerting
 
-rippled provisions six Grafana alert rules on the health-critical metrics, so a
+xrpld provisions six Grafana alert rules on the health-critical metrics, so a
 stock stack alerts out of the box with no UI setup. Rules are provisioned from
 `docker/telemetry/grafana/provisioning/alerting/` and load automatically when
 the Grafana container starts. They appear under **Alerting → Alert rules**,

src/tests/libxrpl/telemetry/ValidationTracker.cpp

@@ -178,7 +178,7 @@ TEST_F(ValidationTrackerTest, MaxPendingEventsTrimming)
     for (std::size_t i = 0; i < kCount; ++i)
     {
         auto const hash = makeHash(i + 1);
-        LedgerIndex const seq = static_cast<LedgerIndex>(i + 1);
+        auto const seq = static_cast<LedgerIndex>(i + 1);
         tracker_.recordOurValidation(hash, seq);
         tracker_.recordNetworkValidation(hash, seq);
     }

src/xrpld/telemetry/MetricsRegistry.cpp

@@ -1032,11 +1032,11 @@ MetricsRegistry::registerPeerQualityGauge()
                 int divergedCount = 0;
 
                 // Encode a version string into BuildInfo's comparable numeric
-                // form. Peers report the full "rippled-3.3.0-b0" string while
+                // form. Peers report the full "xrpld-3.3.0-b0" string while
                 // our baseline is the bare "3.3.0-b0", and SemanticVersion
                 // requires a leading digit, so strip any non-digit prefix
                 // first. Numeric encoding avoids the lexicographic bug where
-                // "2.3.0" > "2.10.0" and "rippled-..." > "3...".
+                // "2.3.0" > "2.10.0" and "xrpld-..." > "3...".
                 auto const encodeVersion = [](std::string_view v) -> std::uint64_t {
                     auto const firstDigit = v.find_first_of("0123456789");
                     if (firstDigit == std::string_view::npos)
@@ -1242,7 +1242,7 @@ MetricsRegistry::registerStateTrackingGauge()
 
                 // State value: 0-4 from OperatingMode, 5=validating, 6=proposing.
                 auto const mode = app.getOPs().getOperatingMode();
-                double stateValue = static_cast<double>(mode);
+                auto stateValue = static_cast<double>(mode);
 
                 // If FULL, refine using consensus info for validating/proposing.
                 if (mode == OperatingMode::FULL)

src/xrpld/telemetry/MetricsRegistry.h

@@ -142,7 +142,8 @@
 #ifdef XRPL_ENABLE_TELEMETRY
 #include <opentelemetry/metrics/meter.h>
 #include <opentelemetry/metrics/meter_provider.h>
-#include <opentelemetry/metrics/observer_result.h>
+#include <opentelemetry/nostd/shared_ptr.h>
+#include <opentelemetry/nostd/unique_ptr.h>
 #include <opentelemetry/sdk/metrics/meter_provider.h>
 #endif