v0.2.293 local audit module split

Build/static-gate prerelease for the Steam version-selection audit-module refactor.

Changes:

• Split cloud-safety audit checks into focused branch-switch, push-request, evidence-marker, local-backup, and startup-context modules.
• Split helper-boundary audit-module inventory into runtime, auth/cloud, support/docs, and portal/action modules.
• Split portal UX support audit checks into status, flag, narrative, and feature-registry modules.
• Updated GitHub-facing docs with the new build-only prerelease metadata.

APK:

• Asset: StS2Launcher-v0.2.293-local-audit-module-split-arm64-v8a.apk
• SHA-256: 581892136b538f8e57567a2c2981c31a54e980513c1030b92a0a4a926a4b8d11
• Package: com.sts2launcher.overhaul.fork.local
• VersionName: 0.2.293-local-audit-module-split
• VersionCode: 293000

Validation:

• PowerShell parser check passed for audit-steam-version-selection scripts.
• audit-steam-version-selection.ps1 -Quiet passed 515 checks.
• run-multi-version-runtime-release-gates.ps1 -Quiet passed, including branch guidance parity.
• dotnet build src/STS2Mobile/STS2Mobile.csproj -c Release --no-restore -v:q passed.
• build-android-local.ps1 produced and verified the ARM64 APK.
• APK crypto patch verification passed.

Scope and safety:

• This is build/static-gate evidence only. It does not replace ARM64 public/public-beta runtime evidence.
• No Steam Cloud Push was run during this validation.