Add OpenTelemetry observability with local JSONL traces (#347)

Co-authored-by: 0xallam <ahmed39652003@gmail.com>

tests/telemetry/test_flags.py

@@ -0,0 +1,28 @@
+from strix.telemetry.flags import is_otel_enabled, is_posthog_enabled
+
+
+def test_flags_fallback_to_strix_telemetry(monkeypatch) -> None:
+    monkeypatch.delenv("STRIX_OTEL_TELEMETRY", raising=False)
+    monkeypatch.delenv("STRIX_POSTHOG_TELEMETRY", raising=False)
+    monkeypatch.setenv("STRIX_TELEMETRY", "0")
+
+    assert is_otel_enabled() is False
+    assert is_posthog_enabled() is False
+
+
+def test_otel_flag_overrides_global_telemetry(monkeypatch) -> None:
+    monkeypatch.setenv("STRIX_TELEMETRY", "0")
+    monkeypatch.setenv("STRIX_OTEL_TELEMETRY", "1")
+    monkeypatch.delenv("STRIX_POSTHOG_TELEMETRY", raising=False)
+
+    assert is_otel_enabled() is True
+    assert is_posthog_enabled() is False
+
+
+def test_posthog_flag_overrides_global_telemetry(monkeypatch) -> None:
+    monkeypatch.setenv("STRIX_TELEMETRY", "0")
+    monkeypatch.setenv("STRIX_POSTHOG_TELEMETRY", "1")
+    monkeypatch.delenv("STRIX_OTEL_TELEMETRY", raising=False)
+
+    assert is_otel_enabled() is False
+    assert is_posthog_enabled() is True