[StanleyLl0yd]

Scope

• Bump macOS app version to 0.2.1 (build 3) in both Xcode configurations.
• Request v0.2.1 through the existing exact-main release pipeline.
• Update EN/RU README, release guidance and agent release rules.
• Preserve previous v0.2.0 artifacts and the still-deferred production AppIcon work (Production release gate: redesign and approve the macOS AppIcon #159).

Test focus

• Includes merged PRs fix(ui): keep disk summary and selected-item actions readable #157 and fix(sunburst): clarify inspected vs selected sectors and reduce focus halo #158: disk-usage header, readable toolbar action labels, restricted-folder warning, Sunburst focus/inspection and ring contrast.
• Device acceptance remains open in DiskUsage 0.2.1: real-Mac test acceptance #155, not implied by CI.

Gates

• Require exact-head macOS Debug XCTest and Release build, Actions Policy, Gitleaks, CodeQL Swift/Actions, SonarCloud, dependency review.
• Merge only after all applicable required checks pass. Merging updates .release/request.json and invokes the existing release workflow on exact merged main, which verifies all main gates, builds ZIP+DMG, publishes SHA256SUMS and checks downloaded assets.

Unsigned/unnotarized numeric test version only. No production 1.0.0 approval, signing changes or icon changes.