Add story-style examples suite (27 stories + harness + CI) (#2957)

examples/stories/pagination/README.md

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+# pagination
+
+Walk a paginated `resources/list` by hand: feed each result's `next_cursor`
+back into `list_resources(cursor=...)` until it is `None`. The cursor is an
+opaque server-chosen string — never parse it, and never terminate on a falsy
+check (an empty string is a valid cursor under the spec).
+
+## Run it
+
+```bash
+# stdio (default — the client spawns the server as a subprocess)
+uv run python -m stories.pagination.client --server server_lowlevel
+
+# HTTP — the client self-hosts the server on a free port, runs, then tears it down
+uv run python -m stories.pagination.client --http --server server_lowlevel
+```
+
+Drop `--server server_lowlevel` (on either transport) to run against the
+`MCPServer` variant (single page).
+
+## What to look at
+
+- `client.py` `main` — `async with Client(target, mode=mode) as client:` is the
+  whole connection. The story owns the construction; `target` is whatever
+  `Client()` accepts (an in-process server, a transport, or an HTTP URL) and
+  the entry point picks it.
+- `client.py` — `if page.next_cursor is None: break`. Termination is
+  key-absent, not falsy; `while cursor:` would be a spec bug.
+- `server_lowlevel.py` — the handler owns the cursor encoding (here: an
+  integer offset as a string) and rejects an unrecognised cursor with
+  `-32602 Invalid params`, the spec-recommended response.
+- `server.py` — `MCPServer`'s decorator-registered resources are returned in
+  a single page; the inbound `cursor` is accepted but ignored. The same client
+  loop still terminates correctly after one request.
+
+## Caveats
+
+- **No `iter_*()` helper** — `Client` has no `iter_resources()` /
+  `iter_tools()` async-iterator yet; the manual `while True` loop shown here
+  is the supported pattern.
+- **MCPServer is single-page** — `MCPServer` ignores `cursor` and never sets
+  `next_cursor`. Whether it grows a `page_size=` knob or stays single-page by
+  design is open; use the lowlevel server when you need to emit pages today.
+
+## Spec
+
+[Pagination — server utilities](https://modelcontextprotocol.io/specification/2025-11-25/server/utilities/pagination)
+
+## See also
+
+`resources/`, `tools/`, `prompts/` — every `*/list` method paginates the same
+way. Reference test: `tests/interaction/lowlevel/test_pagination.py`.