chore(graphify): move graph output to gitignore

graphify-out/ is a local dev artifact (like .svelte-kit/) — the
post-commit hook keeps it fresh on disk automatically. No need to
track it in git; removes the commit-after-every-commit noise.

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

.gitignore

@@ -35,9 +35,8 @@ temp/
 test_results
 test-results
 
-# graphify knowledge graph — exclude derived/cache files
-graphify-out/cache/
-graphify-out/graph.html
+# graphify knowledge graph — local dev artifact, not committed
+graphify-out/
 src/graphify-out/
 
 # Claude Code local settings (machine-specific)