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### Overview This PR: - Updates `app-server-test-client` to load OTEL settings from `$CODEX_HOME/config.toml` and initializes its own OTEL provider. - Add real client root spans to app-server test client traces. This updates `codex-app-server-test-client` so its Datadog traces reflect the full client-driven flow instead of a set of server spans stitched together under a synthetic parent. Before this change, the test client generated a fake `traceparent` once and reused it for every JSON-RPC request. That kept the requests in one trace, but there was no real client span at the top, so Datadog ended up showing the sequence in a slightly misleading way, where all RPCs were anchored under `initialize`. Now the test client: - loads OTEL settings from the normal Codex config path, including `$CODEX_HOME/config.toml` and existing --config overrides - initializes tracing the same way other Codex binaries do when trace export is enabled - creates a real client root span for each scripted command - creates per-request client spans for JSON-RPC methods like `initialize`, `thread/start`, and `turn/start` - injects W3C trace context from the current client span into request.trace instead of reusing a fabricated carrier This gives us a cleaner trace shape in Datadog: - one trace URL for the whole scripted flow - a visible client root span - proper client/server parent-child relationships for each app-server request