router: add enable_art toggle for ART

[ekroon]

What

• add a new router config option enable_art (ENABLE_ART) to enable ART and query plan headers independently from dev_mode
• propagate this option through router initialization (WithEnableArt) into the GraphQL pre-handler
• allow ART request options when enable_art is true, even without a control plane JWT token
• include enable_art in router usage tracking
• update config schema and config golden fixtures

Why

Operators need a way to enable ART behavior without turning on full development mode.

Testing

• go test ./pkg/config/... -update
• go test ./...

Summary by CodeRabbit

• New Features
  • Added a new enable_art configuration option to enable Advanced Request Tracing (ART) and query plan visibility independently, without requiring development mode or Cosmo Cloud authentication tokens.
  • Provides more granular control over Advanced Request Tracing features through router configuration.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between f271ff2 and 1c78223.

📒 Files selected for processing (9)

• router/core/graph_server.go
• router/core/graphql_prehandler.go
• router/core/router.go
• router/core/router_config.go
• router/core/supervisor_instance.go
• router/pkg/config/config.go
• router/pkg/config/config.schema.json
• router/pkg/config/testdata/config_defaults.json
• router/pkg/config/testdata/config_full.json

---

Walkthrough

This PR adds an EnableArt configuration flag throughout the router codebase, enabling Advanced Request Tracing (ART) and query plan headers without requiring development mode or authentication. The flag is propagated from configuration through router initialization, prehandler, and graph mux construction layers.

Changes

Cohort / File(s)	Summary
Configuration Layer router/pkg/config/config.go, router/pkg/config/config.schema.json, router/pkg/config/testdata/config_defaults.json, router/pkg/config/testdata/config_full.json	Added new public field EnableArt (boolean) with default value false to config struct, schema definition, and test fixtures. Enables ART configuration independently of development mode.
Router Option & Initialization router/core/router.go, router/core/router_config.go, router/core/supervisor_instance.go	Added WithEnableArt() option constructor and internal enableArt field to router, propagated through supervisor's option chain, and added usage tracking.
Request Processing router/core/graphql_prehandler.go, router/core/graph_server.go	Added EnableArt field to PreHandlerOptions and BuildGraphMuxOptions; modified request option parsing to allow ART when either development mode or enableArt is enabled, bypassing authentication requirement.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Possibly related issues

• Independent configuration for Advanced Request Tracing (ART) #2555: Requests addition of enable_art flag to enable ART independently of development mode and authentication, which is directly addressed by this PR's feature implementation.

Possibly related PRs

• feat: client response expressions #2472: Modifies the same BuildGraphMuxOptions propagation path in router/core/graph_server.go to add runtime feature configuration to graph mux construction.
• feat: option to redact query param variables in access logs #2130: Modifies the graph mux construction pipeline in router/core/graph_server.go, adding different options to the setup flow.

✨ Finishing Touches

• 📝 Generate docstrings (stacked PR)
• 📝 Generate docstrings (commit on current branch)

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