feat: publish Dever core with project scaffolding and versioned AI skills

.trellis/tasks/09-20-production-api/check.jsonl

@@ -0,0 +1,3 @@
+{"file":".trellis/spec/backend/quality-guidelines.md","reason":"Bounded HTTP/1, HTTP/2 and resource tests"}
+{"file":".trellis/spec/backend/error-handling.md","reason":"Input/API/internal error mapping"}
+{"file":".trellis/spec/backend/directory-structure.md","reason":"Thin API owner and shared HTTP path"}