docs(release): add 2.1.0 release notes

planning/releases/2.1.0.md

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+# modern-di-flask 2.1.0 — adopt the modern-di integration kit
+
+Maintenance release. **No public API change** — `FromDI`, `inject`,
+`setup_di`, `fetch_di_container`, and `flask_request_provider` 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).
+Fifth 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),
+[`modern-di-fastapi` 2.10.0](https://github.com/modern-python/modern-di-fastapi/releases/tag/2.10.0),
+[`modern-di-litestar` 2.13.0](https://github.com/modern-python/modern-di-litestar/releases/tag/2.13.0),
+and
+[`modern-di-aiohttp` 2.2.0](https://github.com/modern-python/modern-di-aiohttp/releases/tag/2.2.0)).
+The simplest conversion so far: Flask has exactly one connection type and is
+fully synchronous.
+
+## Internal refactors
+
+- **`_enter_request` now derives scope/context via
+  `integrations.bind(flask_request_provider, connection)`** instead of
+  hand-writing `scope=Scope.REQUEST, context={Request: connection}`. Flask
+  has no WebSocket counterpart, so there's only ever one provider — no
+  `classify_connection` dispatch is needed anywhere.
+- **No `Container` context-manager block is introduced.** Flask's
+  `before_request`/`teardown_appcontext` stay two separate hook callbacks,
+  unchanged in shape — unlike the middleware-wrapping pattern used in the
+  starlette/fastapi/litestar/aiohttp conversions.
+- **`_FromDI`/`_parse_inject_params` are gone.** `FromDI =
+  integrations.from_di`; `inject` now composes
+  `integrations.parse_markers`/`integrations.resolve_markers`.
+- **The three hand-written `"__modern_di_injected__"` string-attribute
+  touch points are now `integrations.is_injected`/`integrations.mark_injected`** —
+  same underlying attribute name, so this is a behavioral no-op.
+
+## Packaging
+
+- Bumps the `modern-di` floor to `>=2.28,<3`.
+
+## Downstream
+
+No action needed — the public API (`FromDI`, `inject`, `setup_di`,
+`fetch_di_container`, `flask_request_provider`) is unchanged. 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`: 4 planned tasks, each with an
+  independent spec+quality review; a whole-branch review before merge.