chore: update documentation and config (#8)

- Replace docs/conventions.md with docs/context.md
- Update .gitignore with additional patterns

Author: TimPietruskyRunPod

.gitignore

@@ -180,6 +180,10 @@ node_modules
 # ai-sdk
 generated-image*
 edited-image*
+*.mp4
 
 # mastra
-mastra.db
+mastra.db
+
+# mac
+.DS_Store