docs: cut 1.3.3 notes for the tier work

CHANGELOG gets all five breaking changes, not the one the draft had:
ThinkingCapability's constructor, two ports that grew a parameter with
no default, resolve_thinking's new return type, and ProviderProfile's
single wire field. Behaviour changes get their own section, including
the one that is easy to miss — the openai fallback segment no longer
refuses an unknown shape, so a downstream that parks a foreign model
there and asks for thinking used to fail at assembly and now sends
nothing at all. minimax is called out as the exception it is: the gateway
proved M3 does not think without a parameter, so that segment keeps its
medium and its downstreams see no change this release.

The capability table is reported as it stands — 17 of 24 rows measured,
7 still on documentation, with the reason each one went unmeasured, so
nobody reads "measured" into a row that is a guess. The auto limitation
and its deliberate MiniMax-M3 inconsistency are written down rather than
left for someone to trip over; issue #21 holds the real fix.

ARCHITECTURE had five claims that measurement showed had gone false:
the cache key formula, the field count, the reconcile predicate and its
throttle key, and two field lists. README's FIELD set was missing the
two new keys it calls exhaustive.

docs-convention still opened by announcing a 17-page site that has not
existed since August. It now says what is actually there — one placeholder
page pointing at .env.example, CHANGELOG and the source docstrings — and
says which four files carry the sync gate while the site is down.

research-wiki/docs-convention.md

@@ -2,7 +2,12 @@
 
 > **定位**: 用户文档站 = Gitea Wiki(`https://gitea.iomgaa.online/iomgaa/PolyGateway/wiki`);本文规定它的结构、更新时机与写作纪律。研发知识(设计/决策/验收)仍归 `research-wiki/`,两者职责不重叠。
 
-## 1. 结构:Diátaxis 四区(2026-07-23 建站,17 页)
+> [!CRITICAL]
+> **现状(2026-08-02 起):文档站已全量下线,当前只剩 `Home` 一页占位。** 八轮审查累计确认 93 处与源码不一致,近半落在参考区(手工镜像源码里已有的事实,必然漂移),且修正本身在引入次生偏差,逐轮修补不收敛——过期文档比没有文档更危险,它看起来权威。
+> Home 页现在做的唯一一件事是**把下游指向真实事实源**:签名/字段/参数语义 → 源码 docstring;全量环境变量键 → `.env.example`;版本变更与下游注意事项 → `CHANGELOG.md`;架构决策与行为论证 → `research-wiki/ARCHITECTURE.md`;快速上手 → `README.md`。
+> 历史内容未丢失,全在 wiki 仓库的 git 历史里(`git checkout e78bfb9 -- .`)。**本文以下各节描述的是重建时的目标结构与纪律,不是当前站点的现状**;在文档站重建之前,下面凡指向具体 wiki 页面的条目一律**不可执行**。
+
+## 1. 结构:Diátaxis 四区(重建目标;2026-07-23 建站 17 页,2026-08-02 全量下线)
 
 | 区 | 页面 | 职责(读者此刻要干什么) | 禁止 |
 |---|---|---|---|
@@ -25,6 +30,8 @@
 
 **门**: 版本 bump 的提交不允许单独存在——同一次交付里必须包含对应的 wiki/CHANGELOG 同步(发布检查清单第一项)。
 
+**站点下线期间(2026-08-02 至文档站重建)本表如何执行**: 上表左列的判据照旧,右列中指向具体 wiki 页面的项**全部落空,不必也无法执行**;仍然必须做的是 `CHANGELOG.md`、`README.md`、`.env.example` 与 `research-wiki/ARCHITECTURE.md` 四处。这道门因此**没有放松**——只是承接方从 wiki 换成了这四个文件,漏改它们与从前漏改 wiki 是同一性质的失败。
+
 ## 3. 写作纪律
 
 - 中文;表格优先;单个代码块 ≤ 15 行;每个配置片段可直接复制运行。