feat(journal): update week 7

journal/week7.typ

@@ -0,0 +1,21 @@
+#import "template.typ": week, day
+
+#show: week.with(num: 7)
+
+#day(1)
+
+- better handle type variables
+- write simple demo script
+- various fixes
+
+#day(2)
+
+- weekly meeting
+- start implementing data-frame and column types
+
+#day(3)
+
+- statically check cast expressions on literal values
+- add unsafe cast
+- setup user manual
+- setup report