Add review-process + glauth design docs, bench scripts; ignore install/

Picks up the missing glauth.md referenced by CLAUDE.md, captures the
review workflow alongside the bench-read-bulk and review-readme helper
scripts, and excludes the local install/ deployment tree from source.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.gitignore

@@ -45,6 +45,7 @@ build/
 out/
 tmp/
 temp/
+install/
 
 # .NET
 **/bin/