Migrate API v1 simulation services to centralized observability

Start by locating the API v1 simulation entry, Modal gateway, executor, and batch workers named in the scope, then inspect their current Logfire and telemetry setup. Review the existing deployment configuration and service-level tests before changing the observability integration. Done means all participating services emit the version 2 schema, preserve allowlisted correlation metadata, contain no Logfire runtime path, and remain unaffected when telemetry fails.

Summary

Migrate the API v1 simulation entry, Modal gateway, executor, and batch workers to policyengine-observability 2.0 and central Google Cloud telemetry.

Scope

• Replace version 1 global helpers with runtime-bound operations and spans.
• Remove Logfire initialization, secrets, dependencies, and forced OpenTelemetry disablement.
• Carry allowlisted request and trace correlation metadata from entry to gateway to worker.
• Configure explicit service identity, environment, collector endpoint, Google project, and Workload Identity Federation credentials for approved API v1 applications.
• Add service-level failure-isolation tests.
• Keep other PolicyEngine applications outside this change.

Acceptance criteria

• Each participating service emits the version 2 structured log schema.
• Worker operations restore incoming correlation metadata without including simulation inputs or reform payloads.
• No Logfire runtime path remains in these services.
• Failed telemetry setup or export does not change simulation outcomes.
• Relevant formatting, lint, unit, integration, and deployment configuration checks pass.