House rules: the build checks them, and every refusal from the server answers 400, 403 or 404

The server no longer answers 409, 413 or 429: a busy probe, a share or upload that is too large and a request over
the limit now answer 400 with the same reason as before, and still say when to try again. The app reads the reason,
so nothing changes for it; versions up to 0.15.4 report a limited speed test as unmeasured until they update.
The app's commands can now be cancelled all the way down, and the house rules are written into PATTERNS.md and
checked on every build, Android included.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01W4YtEJrgxG12Pc39Fai8Bd

AGENT.md

@@ -2,7 +2,7 @@
 
 Read this first. **`PATTERNS.md` is canonical for how code is written** (cite "PATTERNS #n"); **`CLAUDE.md` is the
 quick reference** (commands, map, pitfalls). When a tool in the repo enforces a rule (the compiler, `.editorconfig`,
-`tools/lint.cs`), the tool is the source of truth.
+the house-rules analyzer), the tool is the source of truth.
 
 ## What MeWeb is
 
@@ -19,7 +19,7 @@ Free software under AGPL-3.0, published by Arasaka di Hvozdikov Yevheniy.
 - **No comments in source** — none, of any kind (#42).
 - **No `private`**, no `_` prefixes, **`Nullable` disabled**, **2-space indent**, **`var` everywhere** (#92).
 - **Primary constructors**, `IOptionsMonitor<T>`, `CancellationToken` last and forwarded (#1, #87, #88).
-- **Routes only in `src/MeWeb.Shared/Endpoints.cs`** (#9); DTOs are classes named `View*`, `Upsert*`, `*Form` (#34).
+- **Routes only in `src/MeWeb.Shared/Endpoints.cs`** (#9); DTOs are classes named `View*`, `*Request`, `*Form` (#34).
 - **UI text:** resx keys only, sentence case, every language present, drafts labelled (#39, #50, #125).
 - **Every outbound host is declared** in the app's "What this app contacts" screen (#120).