Harden installer activation against ACC file locks
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# Changelog
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## [2.1.3] - 2026-08-11
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### Added
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- Bounded retry/backoff diagnostics for transient `Directory.Move` locks caused by the Windows loader, antivirus or endpoint protection.
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- A SHA-256-verified copy activation fallback limited to first-time installations with no existing active version.
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- Regression coverage for transient recovery, permanent new-install fallback and permanent update denial without mutation.
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- ACC incident analysis and an AI maintainer handoff document.
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### Changed
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- Install, update, rollback and uninstall directory moves now use eight bounded attempts over at most 19.75 seconds.
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- Setup completion logs record the activation method and preservation state of both backup and staging directories.
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- Product and setup version advanced to 2.1.3.
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## [2.1.2] - 2026-08-11
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### Added
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- Complete XML documentation for types and methods across application, setup, packager and regression projects, including parameters, generic type parameters and return values.
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