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

.trellis/tasks/09-29-external-lib-packaging/implement.jsonl

@@ -0,0 +1,4 @@
+{"file":".trellis/spec/backend/toolchain-and-library.md","reason":"native build、cache、standalone output 和 runtime lifecycle"}
+{"file":".trellis/spec/backend/compiler-contracts.md","reason":"closed Adapter reachability、effects 和 test fake"}
+{"file":".trellis/tasks/09-06-private-compiler-distribution/prd.md","reason":"正式 target/runtime pack 与公开发行边界"}
+{"file":".trellis/tasks/09-29-external-lib-ecosystems/design.md","reason":"locked environment 与 runtime pack 输入合同"}