Split agent-service out of the service label

[Yicong-Huang]

Task Summary

Split agent-service out of the broad service label so an agent-service-only PR runs only the agent-service CI stack, not the scala stack.

Context

Today the labeler's service rule matches every *-service/** directory, which includes both the scala-side services (access-control-service, config-service, file-service, computing-unit-managing-service, workflow-compiling-service, pyright-language-service) and agent-service. With the LABEL_STACKS map introduced in #4640, the service label maps to ["scala", "agent-service"], so any agent-service-only PR also triggers the full scala build.

Proposal

.github/labeler.yml:

• Replace service's *-service/** glob with the enumerated scala-side service directories (actions/labeler@v6 does not support exclusion semantics in any-glob-to-any-file, so a !agent-service/** negation does not work).
• Add a new agent-service label matching agent-service/**.

.github/workflows/required-checks.yml LABEL_STACKS:

service        -> { scala }
agent-service  -> { agent-service }

PRs that touch both stay covered: each label is applied independently and the run set is the union.

⚠️ Requires a repo admin to create the agent-service label in the repo before the labeler workflow can apply it (actions/labeler@v6 does not auto-create labels).

Priority

P2 – Medium

Task Type

• Code Implementation
• DevOps / Deployment