[abooodbah]

What changes

Version 0.5.1, following #40's files:

• Cargo.toml, Cargo.lock (the four workspace crates), CITATION.cff (version and date), the app manifest (0.5.1.0), the bug report placeholder.
• .github/workflows/windows.yml publishes docs/releases/v0.5.1.md as the release notes.
• CHANGELOG.md, the release notes, README.md and installer/README.md (asset names and the executable size), docs/ARCHITECTURE.md (version named), PROGRESS.md (Make a zoom step change only the rows and paint once #43, Draw thin theme-coloured scroll bars and fit the shortcut list #44 and this PR).

SECURITY.md and the format tables name the 0.5 line and stay as they are.

Measured

The numbers in the notes come from one run on the maintainer's laptop: a local build of 0.5.0 (d323dbf, the 0.5.0 code) and this branch, measured the same way with the harnesses from #43 and #44, saved zoom set to 100% for the runs and put back.

The first zoom run on the 10M-row file had single steps of up to 0.7 s on 0.5.0 and 1.1 s on 0.5.1 (0.5.0 median 133.5 ms, 0.5.1 median 23.2 ms); the notes use a second run (115.4 and 21.0 ms). Start times in this run were about 15 to 80 ms higher on both versions than in the #44 runs; the two versions were within 4 ms of each other.

Checks

• cargo test --workspace: 273 passed. One test failed once in five runs on this branch and passed in the other four; the run did not keep its name. No test changed in this PR.
• The release build reports file version 0.5.1.0.

What the merge and the tag start

• Merging runs Windows quality and release on main. pages.yml does not run (no site/ change).
• The annotated tag v0.5.1 on the merge commit runs Windows quality and release for the tag, which publishes the GitHub release with the unsigned ZIP and its .sha256, and store-msix.yml, which builds the Store package.

Rollback

Revert this commit. No data or settings format changes. A published tag and release would need deleting by hand.

Not in this PR

• The post-release update of site/, store/listing.md and docs/VALIDATION_STATUS.md.
• Scoop, winget, Chocolatey and Partner Center.
• store-msix.yml still gives v0.5.0 as its example tag.