chore: update .gitignore for SEC data and tool configs

Add .qoder/ (local tool settings) and SEC fundamental data
(sec_frames/, sec_company_tickers.json) to prevent large
downloaded datasets from being tracked.

.gitignore

@@ -1,4 +1,5 @@
 .claude
+.qoder/
 
 # Python
 __pycache__/
@@ -26,6 +27,10 @@ data/attribution_*/
 data/factors/
 data/factors_review_tmp/
 
+# SEC fundamental data — fetched from EDGAR API
+data/sec_frames/
+data/sec_company_tickers.json
+
 # External tool artifacts
 docs/superpowers/