feat(stovepipe): tag controller metrics by queue

[mnoah1]

Summary

Intent:

• Make controller metrics attributable to their logical queue.
• Enforce request-local metric scoping without mutating shared controllers.

Changes:

• Add a metrics factory that resolves queue-bound scopes from explicit config.
• Pass typed queue-scoped metrics through every primary and DLQ controller path.
• Keep pre-decode failures explicitly unscoped and cover queue tags in tests.

Test Plan

• Exercise primary and DLQ controller metric paths and assert emitted series carry the expected queue tag.
• Run the affected packages with the Go race detector and targeted Bazel tests.

Revert Plan

• Revert this commit to restore the prior unscoped controller metrics.

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Issues