docs(release): add 2.2.0 notes (adopt the modern-di integration kit)

planning/releases/2.2.0.md

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+# modern-di-starlette 2.2.0 — adopt the modern-di integration kit
+
+Internal refactor, no API change. Swaps this package's hand-rolled
+connection-dispatch loop and `FromDI`/parse/resolve triad for the shared
+primitives in [`modern_di.integrations`](https://github.com/modern-python/modern-di/blob/main/architecture/integration-kit.md),
+shipped in
+[modern-di 2.28.0](https://github.com/modern-python/modern-di/releases/tag/2.28.0).
+This is the first of 13 planned adapter conversions across the `modern-di`
+ecosystem.
+
+## Internal
+
+- `_DIMiddleware`'s isinstance-over-tuple connection dispatch is now
+  `integrations.classify_connection`.
+- The child container's manual `try`/`finally: await child_container.close_async()`
+  is now `Container`'s own `async with` — entering an already-open container
+  is a no-op; exiting closes it, including on the exception path.
+- `_FromDI`, `_parse_inject_params`, and `_resolve_di_params` are gone.
+  `FromDI` is now a direct re-export (`FromDI = integrations.from_di`);
+  `inject` calls `integrations.parse_markers`/`integrations.resolve_markers`.
+- `architecture/container-lifecycle.md`, `architecture/dependency-resolution.md`,
+  and `architecture/glossary.md` updated to describe the new internals.
+
+## Packaging
+
+- Bumps the `modern-di` floor to `>=2.28.0,<3`.
+
+## Downstream
+
+No action needed — the public API (`setup_di`, `FromDI`, `@inject`,
+`fetch_di_container`, `starlette_request_provider`/`starlette_websocket_provider`)
+is unchanged, and no test in this package's own suite needed to change.
+Upgrading only requires `modern-di>=2.28.0`.
+
+## Internals
+
+- 100% line coverage; `ruff`, `ty` clean across Python 3.10–3.14.
+- Built via `subagent-driven-development`: 5 planned tasks, each with an
+  independent spec+quality review; a whole-branch review before merge.