Add OpenTelemetry observability with local JSONL traces (#347)

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

tests/config/__init__.py

@@ -0,0 +1 @@
+"""Tests for strix.config module."""

tests/config/test_config_telemetry.py

@@ -0,0 +1,55 @@
+import json
+
+from strix.config.config import Config
+
+
+def test_traceloop_vars_are_tracked() -> None:
+    tracked = Config.tracked_vars()
+
+    assert "STRIX_OTEL_TELEMETRY" in tracked
+    assert "STRIX_POSTHOG_TELEMETRY" in tracked
+    assert "TRACELOOP_BASE_URL" in tracked
+    assert "TRACELOOP_API_KEY" in tracked
+    assert "TRACELOOP_HEADERS" in tracked
+
+
+def test_apply_saved_uses_saved_traceloop_vars(monkeypatch, tmp_path) -> None:
+    config_path = tmp_path / "cli-config.json"
+    config_path.write_text(
+        json.dumps(
+            {
+                "env": {
+                    "TRACELOOP_BASE_URL": "https://otel.example.com",
+                    "TRACELOOP_API_KEY": "api-key",
+                    "TRACELOOP_HEADERS": "x-test=value",
+                }
+            }
+        ),
+        encoding="utf-8",
+    )
+
+    monkeypatch.setattr(Config, "_config_file_override", config_path)
+    monkeypatch.delenv("TRACELOOP_BASE_URL", raising=False)
+    monkeypatch.delenv("TRACELOOP_API_KEY", raising=False)
+    monkeypatch.delenv("TRACELOOP_HEADERS", raising=False)
+
+    applied = Config.apply_saved()
+
+    assert applied["TRACELOOP_BASE_URL"] == "https://otel.example.com"
+    assert applied["TRACELOOP_API_KEY"] == "api-key"
+    assert applied["TRACELOOP_HEADERS"] == "x-test=value"
+
+
+def test_apply_saved_respects_existing_env_traceloop_vars(monkeypatch, tmp_path) -> None:
+    config_path = tmp_path / "cli-config.json"
+    config_path.write_text(
+        json.dumps({"env": {"TRACELOOP_BASE_URL": "https://otel.example.com"}}),
+        encoding="utf-8",
+    )
+
+    monkeypatch.setattr(Config, "_config_file_override", config_path)
+    monkeypatch.setenv("TRACELOOP_BASE_URL", "https://env.example.com")
+
+    applied = Config.apply_saved(force=False)
+
+    assert "TRACELOOP_BASE_URL" not in applied