feat(HdrHistogram#70): .gitignore does not currently exclude .vs files generated by Visual Studio (HdrHistogram#122)

* plan(HdrHistogram#70): initial brief from issue

* plan(HdrHistogram#70): review brief

* plan(HdrHistogram#70): create task breakdown

* fix(HdrHistogram#70): fix .gitignore IDE artefact exclusions

- Replace spurious `.vs/ ` (trailing space) under `# VS Code` with `.vscode/`
- Removes duplicate/misattributed `.vs/` entry
- Adds missing VS Code workspace directory exclusion
- Retains correct `.vs/` entry under `# Visual Studio cache/options directory`

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* feat(HdrHistogram#70): implement tasks

* feat(HdrHistogram#70): complete implementation

---------

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: leecampbell-codeagent

.gitignore

@@ -14,7 +14,7 @@ TestResults
 ## files generated by popular Visual Studio add-ons.
 
 # VS Code
-.vs/ 
+.vscode/
 
 # User-specific files
 *.suo