chore: gitignore local helper scripts

Ignore the local token-saving Go helpers under scripts/ (peek, cargoclip,
testfail, diffclip, cratemap, sessionpack, etc.) via scripts/*.go. These are
inspection-only dev tools, not committed. Tracked scripts/*.sh and *.md are
unaffected. Replaces a broad, machine-local .git/info/exclude rule.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.gitignore

@@ -35,3 +35,7 @@ deploy/*-auth-secret.yaml
 /.agents/
 /.codex/
 /AGENTS.md
+
+# Local token-saving helper scripts (peek/cargoclip/testfail/diffclip/etc.) —
+# inspection-only Go tools, not committed. Tracked scripts/*.sh and *.md stay.
+scripts/*.go