docs(release): add 2.10.0 notes (adopt the modern-di integration kit)

planning/releases/2.10.0.md

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+# modern-di-fastapi 2.10.0 — adopt the modern-di integration kit
+
+Maintenance release. **No public API change** — `setup_di`, `FromDI`,
+`build_di_container`, `fetch_di_container`, and the context providers keep
+their signatures and behavior. Swaps this package's hand-rolled connection
+dispatch and marker resolution 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 second of 13 planned adapter conversions across the `modern-di`
+ecosystem (after
+[`modern-di-starlette` 2.2.0](https://github.com/modern-python/modern-di-starlette/releases/tag/2.2.0)).
+
+## Internal refactors
+
+- **`build_di_container`'s isinstance-over-tuple connection dispatch is now
+  `integrations.classify_connection`.**
+- **The child container's manual `try`/`finally: await 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.
+- **`Dependency`'s field changes from a raw `dependency` to
+  `marker: integrations.Marker[T_co]`; `__call__` becomes
+  `self.marker.resolve(request_container)`.** `FromDI` now constructs
+  `Dependency(integrations.Marker(dependency))` — its own public signature
+  (`dependency`, `use_cache`) is unchanged.
+- Unlike `modern-di-starlette`'s conversion, this package is a **native-DI**
+  adapter (FastAPI's own `Depends` drives resolution): no `@inject` decorator
+  to replace, no `parse_markers`/`resolve_markers` usage, and no imports
+  become dead.
+
+## Packaging
+
+- Bumps the `modern-di` floor to `>=2.28.0,<3`.
+
+## Downstream
+
+No action needed — the public API (`setup_di`, `FromDI`, `build_di_container`,
+`fetch_di_container`, `fastapi_request_provider`/`fastapi_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.
+- `architecture/container-lifecycle.md` and `architecture/dependency-resolution.md`
+  updated to describe the new internals.
+- Built via `subagent-driven-development`: 5 planned tasks, each with an
+  independent spec+quality review; a whole-branch review before merge.