Fix SwiftLint findings in client tests

[coenttb]

Fixes #5.

Removes the ten reported SwiftLint findings in the two affected client test files only. No public API, error-semantic, target/product, or workflow changes.

Local evidence: workspace package lint --package-path . reports no errors in the touched files; existing advisory findings elsewhere are unchanged. The coordinator’s full-tier Actions qualification remains the merge gate.

[coenttb]

Independent review — CLEAN for commit e2dfb55.

The complete PR diff is confined to the two affected client-test files (10 SwiftLint mechanical corrections: redundant self removal and switch-case spacing). It introduces no API, behavioral, target, product, workflow, or tracking-surface change. The branch is one commit ahead of base 50d3bc7.

Required full-tier workflow_dispatch evidence is still pending; landing remains gated on an exact-head green run and final state guards.

[coenttb]

Independent re-review — BLOCKED for commit 3f20d34.

I read the complete replacement diff against base 50d3bc7. It is limited to three client-test files and consists of mechanically neutral SwiftLint corrections: redundant self removal and switch-case spacing, with the existing Stargazers corrections retained. No production, API, target, workflow, or tracking change is present.

The exact-head CI run https://github.com/swift-foundations/swift-github/actions/runs/30742028060 has a required SwiftLint failure: https://github.com/swift-foundations/swift-github/actions/runs/30742028060/job/91481039312. Its first actionable annotation is redundant_self at Tests/GitHub Core Tests/GitHub.Repository.Content.Client Tests.swift:28, a file outside this PR diff. Therefore the required gate is not satisfied and no full-tier dispatch or merge is authorized.

Next owner: a maintainer with source-edit authority for the Content client test. After a correction is pushed, obtain a new exact-head full-tier workflow_dispatch green result before requesting another landing review. PR #8 and Bug #5 remain open.

[coenttb]

Independent re-review — CLEAN for commit f6702a7.

I read the complete replacement diff against base 50d3bc7. It is confined to four test files and consists of SwiftLint mechanical corrections: redundant self removal and switch-case whitespace. No production, API, error-semantic, target, product, workflow, or tracking change is present.

The strict SwiftLint, Workspace lint, and fresh capped test evidence supplied for this exact head are task-attributed. I independently checked the complete diff and live PR state. The one full-tier workflow_dispatch qualification remains required before landing.

Landing observation: main has no configured branch-protection status-check requirement. Final merge remains contingent on the exact-head full-tier run and immediate state guards.