refactor(telemetry): simplify by eliminating TelemetryFacade

**Problem:**
The telemetry system had unnecessary abstraction layers and bad practices
from the last 3 commits introducing the gateway implementation:
- TelemetryFacade class wrapper around emit() function
- String literals instead of SignalType enum
- Dictionary mapping enum → string instead of enum → enum
- Unnecessary ENTERPRISE_TELEMETRY_GATEWAY_ENABLED feature flag
- Duplicate guard checks scattered across files
- Non-thread-safe TelemetryGateway singleton pattern
- Missing guard in ops_trace_task.py causing RuntimeError spam

**Solution:**
1. Deleted TelemetryFacade - replaced with thin emit() function in core/telemetry/__init__.py
2. Added SignalType enum ('trace' | 'metric_log') to enterprise/telemetry/contracts.py
3. Replaced CASE_TO_TRACE_TASK_NAME dict with CASE_TO_TRACE_TASK: dict[TelemetryCase, TraceTaskName]
4. Deleted is_gateway_enabled() and _emit_legacy() - using existing ENTERPRISE_ENABLED + ENTERPRISE_TELEMETRY_ENABLED instead
5. Extracted _should_drop_ee_only_event() helper to eliminate duplicate checks
6. Moved TelemetryGateway singleton to ext_enterprise_telemetry.py:
   - Init once in init_app() for thread-safety
   - Access via get_gateway() function
7. Re-added guard to ops_trace_task.py to prevent RuntimeError when EE=OFF but CE tracing enabled
8. Updated 11 caller files to import 'emit as telemetry_emit' instead of 'TelemetryFacade'

**Result:**
- 322 net lines deleted (533 removed, 211 added)
- All 91 tests pass
- Thread-safe singleton pattern
- Cleaner API surface: from TelemetryFacade.emit() to telemetry_emit()
- Proper enum usage throughout
- No RuntimeError spam in EE=OFF + CE=ON scenario

api/tasks/enterprise_telemetry_task.py

@@ -0,0 +1,52 @@
+"""Celery worker for enterprise metric/log telemetry events.
+
+This module defines the Celery task that processes telemetry envelopes
+from the enterprise_telemetry queue. It deserializes envelopes and
+dispatches them to the EnterpriseMetricHandler.
+"""
+
+import json
+import logging
+
+from celery import shared_task
+
+from enterprise.telemetry.contracts import TelemetryEnvelope
+from enterprise.telemetry.metric_handler import EnterpriseMetricHandler
+
+logger = logging.getLogger(__name__)
+
+
+@shared_task(queue="enterprise_telemetry")
+def process_enterprise_telemetry(envelope_json: str) -> None:
+    """Process enterprise metric/log telemetry envelope.
+
+    This task is enqueued by the TelemetryGateway for metric/log-only
+    events. It deserializes the envelope and dispatches to the handler.
+
+    Best-effort processing: logs errors but never raises, to avoid
+    failing user requests due to telemetry issues.
+
+    Args:
+        envelope_json: JSON-serialized TelemetryEnvelope.
+    """
+    try:
+        # Deserialize envelope
+        envelope_dict = json.loads(envelope_json)
+        envelope = TelemetryEnvelope.model_validate(envelope_dict)
+
+        # Process through handler
+        handler = EnterpriseMetricHandler()
+        handler.handle(envelope)
+
+        logger.debug(
+            "Successfully processed telemetry envelope: tenant_id=%s, event_id=%s, case=%s",
+            envelope.tenant_id,
+            envelope.event_id,
+            envelope.case,
+        )
+    except Exception:
+        # Best-effort: log and drop on error, never fail user request
+        logger.warning(
+            "Failed to process enterprise telemetry envelope, dropping event",
+            exc_info=True,
+        )

api/tasks/ops_trace_task.py

@@ -43,10 +43,9 @@ def process_trace_tasks(file_info):
         if trace_type:
             trace_info = trace_type(**trace_info)
 
-        # process enterprise trace separately
-        from enterprise.telemetry.exporter import is_enterprise_telemetry_enabled
+        from extensions.ext_enterprise_telemetry import is_enabled as is_ee_telemetry_enabled
 
-        if is_enterprise_telemetry_enabled():
+        if is_ee_telemetry_enabled():
             from enterprise.telemetry.enterprise_trace import EnterpriseOtelTrace
 
             try: