chore: give the package page a body and repo links

1.1.2 went out with an empty description on the registry page: without a
readme field there is no long_description, and twine only warns about
that -- it does not block the upload. Add readme and project.urls, and
record the wider lesson in the release procedure: a release is done when
the pages a downstream user actually opens look right, not when the local
steps go green. Also adds the missing step for creating a Release, which
is why the Releases page sat empty through eight tags.

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## 未发布
+
+- 打包元数据补齐: `readme` 与 `[project.urls]`。1.1.2 及之前的包在 registry 页面上**没有任何说明正文**(缺 `readme` 时 twine 只警告不阻塞),也没有仓库链接。代码零变更,随下一个版本生效。
+
 ## 1.1.2(2026-08-07)
 
 Postgres 遥测撞上建表权限就整体判死的问题(issue #9)。**最小权限部署会静默丢掉全部遥测**: 应用账号有表级 `INSERT`、表也已存在,但没有 schema 的 `CREATE` 权限时,初始化的 `CREATE TABLE IF NOT EXISTS` 被拒 → recorder 永久 no-op,业务调用一切正常,只留一行 warning。下游 CHSAnalyzer3 首次端到端跑的 150+ 次调用耗时/token/成本因此全部丢失,且事后无法补回。