Add the V5.2.9 VERSIONHISTORY entry for YamlEvent end-position spans (#897)

[mwadams]

Summary

• Adds the V5.2.9 entry to VERSIONHISTORY.md for the just-merged feat: add EndLine/EndColumn to YamlEvent #897 (@OpenByteDev): YamlEvent now exposes EndLine/EndColumn, giving every event a half-open source span over its raw text.
• Version number: GitVersion on main is increment: patch and the ladder is aligned to release tags (latest tag 5.2.8, per Realign the 5.2.x VERSIONHISTORY ladder with the release tags #840), so the next release is 5.2.9.
• Entry facts are grounded in the merged code and tests: scalar spans cover the complete source form (plain word, quotes included, block scalar from its |/> header); structural events (stream/document boundaries, collection starts/ends) report zero-width spans — all pinned by YamlEventSpanTests.

Gates

Documentation-only change to root VERSIONHISTORY.md: not a build input (no project references it), not tracked by the code-sample catalog (no entries), no C# code blocks added, and no test project exercises it — the affected set for the build/test/catalog gates is empty.

🤖 Generated with Claude Code

[github-actions]

Test Results

0 files   -     42  0 suites   - 42   0s ⏱️ - 9m 34s
0 tests  - 65 146  0 ✅  - 65 146  0 💤 ±0  0 ❌ ±0 
0 runs   - 82 674  0 ✅  - 82 674  0 💤 ±0  0 ❌ ±0 

Results for commit 0d110b8. ± Comparison against base commit 418550c.

[github-actions]

PR Preview Action v1.8.1
Preview removed because the pull request was closed.
2026-07-22 07:35 UTC