Bring the miner package under the Codecov patch-coverage gate

[JSONbored]

Problem: packages/gittensory-miner is currently fully excluded from the 99%-patch-coverage bar the main src/** codebase is held to in CI — its tests run and must pass, but there's no enforced coverage percentage.

Area: AMS / Testing

Proposal: Add the package to the coverage-include configuration and establish (and enforce) a real coverage baseline for it going forward.

Deliverables:

• The package under real, enforced patch-coverage measurement.

Acceptance criteria:

• CI fails a PR that drops coverage on changed lines in this package, the same way it already does for src/**.

[linear-code]

JSO-3524