chore: gitignore build artifacts (reports/, zig-api/build/)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: hyperpolymath

.gitignore

@@ -85,3 +85,5 @@ ai-cli-crash-capture/
 /opam-repository/
 /package-publishers/
 /lib/
+reports/
+zig-api/build/