Add migration-5-to-7 module: Hibernate 5.6.15 vs 7.4.14 jar diff, compile checks, schema defaults and cheat-sheet snippets

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01YPgGH6aMbSLANL3E2HHmS6

migration-5-to-7/output/02-removed-api-summary.txt

@@ -0,0 +1,15 @@
+== hibernate-core: public classes missing: 828, members removed from classes that remain: 2735, new classes: 5879
+  of the missing classes: 59 were deprecated in 5.6.15, 137 have a class of the same simple name somewhere in 7.4.14
+  packages with the most missing classes:
+      75  org.hibernate.dialect
+      74  org.hibernate.type
+      62  org.hibernate.type.descriptor.java
+      59  org.hibernate.criterion
+      53  org.hibernate.cfg
+      36  org.hibernate.type.descriptor.sql
+      35  org.hibernate.annotations
+      27  org.hibernate.dialect.function
+      25  org.hibernate.sql.ordering.antlr
+      23  org.hibernate.sql
+      23  org.hibernate.tool.hbm2ddl
+      22  org.hibernate.cfg.annotations