feat(lint): expose service_ref and action_ref on the Starlark activity

[jvegmond-tech]

The catalog already stores ServiceRef and ActionRef for every activity (mdl/catalog/tables.go, builder_microflows.go), but ActivitiesFor did not select them and activityToStarlark did not expose them, so a custom rule could find a RestCallAction yet learn nothing about what it calls.

This blocks rules of the form 'every outbound integration must be configured correctly' - the caller can identify the activity type but not the service or operation behind it.

Verified in the mxcli dev container: - make build — passes - go test ./mdl/linter/... — passes (mdl/linter and mdl/linter/rules)

[github-actions]

AI Code Review

Critical Issues

• None

Moderate Issues

• None

Minor Issues

• The PR exposes service_ref and action_ref fields in the Starlark activity context but does not include any test updates to verify the new fields are correctly populated and accessible in Starlark rules. While the change is small and additive, adding a test (e.g., in mdl-examples/bug-tests/ or mdl-examples/doctype-tests/ for linter rules) would strengthen confidence.

What Looks Good

• The change is minimal, focused, and follows existing patterns in the codebase.
• SQL query updates correctly select the new columns with proper null handling.
• Starlark representation and documentation are updated consistently.
• No syntax changes, so full-stack consistency and MDL design checks are not applicable.
• The change addresses the stated problem: enabling lint rules to access service/action details for activities like RestCallAction.

Recommendation
Approve the PR. The change is safe, well-scoped, and solves the blocking issue for lint rules. While adding a test would be ideal, it is not strictly required per the checklist for this type of internal helper change (not a new package, executor command, or MDL syntax change). The existing test suite should continue to pass as the change is additive and non-breaking.

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