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

.trellis/tasks/archive/2026-10/10-04-external-command/check.jsonl

@@ -0,0 +1,3 @@
+{"file":".trellis/spec/backend/quality-guidelines.md","reason":"定向验证、真实执行和资源所有权"}
+{"file":".trellis/spec/backend/compiler-contracts.md","reason":"命令合同不得扩散到API和Worker"}
+{"file":".trellis/spec/backend/toolchain-and-library.md","reason":"打包闭包与沙箱完整性"}