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06 - atomic update

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# Changelog
Reader-facing changes to the articles, architecture decisions, diagrams, and practical examples, newest first. Entries are grouped by commit date and summarize the Git history; issue references are included where recorded in commit messages. File links open the current material, while commit links show the historical changes.
Reader-facing changes to the articles, architecture decisions, diagrams, and practical examples, newest first. New work is listed by change date; older entries summarize the Git history by commit date. Issue references are included where recorded in commit messages. File links open the current material, while commit links show the historical changes.
When adding or revising material, add a short entry under the relevant date with links to the affected files and any related issue or commit.
## 2026-10-20
- Added [chapter 06: Atomic Updates](docs/06-atomic-updates.md), covering preparation before activation, durable state, gaps between records, restart decisions, and the limits of package recovery.
- Added [ADR-018: Prepare and Verify Before Activation](adr/ADR-018-prepare-and-verify-before-activation.md) and [ADR-019: Recover Interrupted Updates From Durable State](adr/ADR-019-recover-interrupted-updates-from-durable-state.md).
- Added PlantUML sources for the [installation sequence](diagrams/plantuml/ab-installation-sequence.puml) and [restart decisions](diagrams/plantuml/ab-installation-recovery.puml). No new image previews are included.
- Added a [C++17 interrupted installation model](examples/simulations/interrupted-installation/readme.md), with reset points, three supplied boot-record write outcomes, recovery checks, and CMake/CTest support. It models completed durable operations in memory, not real power-loss-safe storage.
- Applied the root [.clang-format](.clang-format) to the new model and the existing [A/B trial boot example](examples/simulations/ab-trial-boot/readme.md). Existing C++ changes are formatting only.
- Updated the [README](readme.md), [series overview](docs/00-series-overview.md), [chapter 05 continuation](docs/05-storage-layout.md), and [diagram index](diagrams/readme.md).
## 2026-10-11
### Storage layout