📝 Say compat is CI-only and run by hand locally

The pipeline bullet's "(push to `main` / tag)" read like a local push hook.
State plainly that `compat` has no local tier — it is not in `check`, `verify`,
`test:ci` or any hook — and is run manually with `build && test:compat`.

development/ci.md

@@ -6,9 +6,12 @@ the job graph; this file records why it is shaped the way it is.
 ## Pipeline
 
 - **`build`** (push to `main` / tag) — build + correctness + packaging.
-- **`compat`** (push to `main` / tag) — type-check the suite and a consumer
-  fixture against the minimum supported TypeScript; consumes `build`'s `dist/`
-  and gates `publish`. See [§ TypeScript compatibility](#typescript-compatibility).
+- **`compat`** (CI only) — type-check the suite and a consumer fixture against
+  the minimum supported TypeScript; consumes `build`'s `dist/` and gates
+  `publish`. It has **no local tier**: it never runs in a hook or in
+  `check` / `verify` / `test:ci`; run it by hand with
+  `npm run build && npm run test:compat`. See
+  [§ TypeScript compatibility](#typescript-compatibility).
 - **`maintain`** (push to `main`, non-blocking) — `npm run maintain`; reports,
   never fails the build.
 - **`publish`** (tag) — packaging checks + `publish:publint` / `publish:attw`,
@@ -151,8 +154,9 @@ source of truth) and documented in [README § Requirements](../README.md#require
   put a second compiler in the local `check` / `verify` loop and every editor.
 - **CI-only is the point.** `npx` fetches over the network — like `maintain`'s
   scans, a network-bound check is never a local feedback tier (see
-  [workflow.md § Feedback tiers](./workflow.md#feedback-tiers)). Locally the
-  same gate is reproducible with `npm run build && npm run test:compat`.
+  [workflow.md § Feedback tiers](./workflow.md#feedback-tiers)). It is not in
+  `check`, `verify`, `test:ci` or any hook; locally it is run **by hand** with
+  `npm run build && npm run test:compat`.
 - **`compat` consumes `build`'s artifact** rather than rebuilding, so it judges
   the exact bytes `check`, `test:ci` and `publint` saw.
 - **`compat` gates `publish`** because the types are the feature: an artifact