P2.4: Update .gitignore and .dockerignore for JSON storage

Drop pysentry.yaml references; add gosentry.json and jobs.json.
Keep *.yaml wildcard to ignore legacy files during import window.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

.gitignore

@@ -9,9 +9,9 @@ cmd/gosentry/*.syso
 *.test
 
 # Runtime files created next to the executable during local runs.
-gosentry.yaml
-pysentry.yaml
-jobs.yaml
+gosentry.json
+jobs.json
+*.yaml
 logs/
 
 # Go workspace/cache files that should stay local if a developer creates them.