docs(release): add 2.1.0 release notes

planning/releases/2.1.0.md

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+# modern-di-arq 2.1.0 — adopt the modern-di integration kit
+
+Maintenance release. **No public API change** — `FromDI`, `inject`,
+`setup_di`, and `fetch_di_container` keep their signatures and behavior.
+Swaps this package's hand-rolled `FromDI` marker and its parse/resolve pair
+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).
+Tenth 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),
+[`modern-di-aiohttp` 2.2.0](https://github.com/modern-python/modern-di-aiohttp/releases/tag/2.2.0),
+[`modern-di-flask` 2.1.0](https://github.com/modern-python/modern-di-flask/releases/tag/2.1.0),
+[`modern-di-faststream` 2.10.0](https://github.com/modern-python/modern-di-faststream/releases/tag/2.10.0),
+[`modern-di-typer` 2.3.0](https://github.com/modern-python/modern-di-typer/releases/tag/2.3.0),
+[`modern-di-grpc` 2.1.0](https://github.com/modern-python/modern-di-grpc/releases/tag/2.1.0),
+and
+[`modern-di-celery` 2.1.0](https://github.com/modern-python/modern-di-celery/releases/tag/2.1.0)).
+Like typer/celery, arq has no connection/context object — its per-job `ctx`
+is a bare `dict` — so this is a **Layer-2-only** conversion. Unlike celery,
+arq has no double-wrap guard either, so `is_injected`/`mark_injected` don't
+apply.
+
+## Internal refactors
+
+- **`_FromDI` is gone; `FromDI = integrations.from_di`.**
+- **`inject` now calls `integrations.parse_markers` directly** —
+  `_parse_inject_params` is deleted entirely, its body having been an exact
+  duplicate.
+- **Resolution goes through `integrations.resolve_markers(child, di_params)`**
+  in place of the manual dict comprehension.
+- The task-specific mechanism — the `*args`/`**kwargs` decoration-time
+  `TypeError` guard, by-name signature binding, `functools.wraps`, and the
+  `async def wrapper` shape — is preserved exactly unchanged; none of it is
+  part of the kit.
+- `setup_di` and all four lifecycle-hook wrappers
+  (`on_startup`/`on_shutdown`/`on_job_start`/`on_job_end`) are untouched, as
+  is the existing `_WRAPPED_MARKER` double-`setup_di` guard (a different
+  concern from the kit's injection double-wrap guard).
+- Dead imports removed: `dataclasses`, `providers`, `T_co`.
+- `architecture/dependency-injection.md`'s "Resolution" section promoted to
+  describe the new internals.
+
+## Packaging
+
+- Bumps the `modern-di` floor to `>=2.28,<3`.
+
+## Downstream
+
+No action needed — the public API (`FromDI`, `inject`, `setup_di`,
+`fetch_di_container`) is unchanged. Upgrading only requires
+`modern-di>=2.28.0`.
+
+## Internals
+
+- 100% line coverage; `ruff`, `ty` clean across Python 3.10–3.14. Tests run
+  against a live Redis.
+- Built via `subagent-driven-development`: 4 planned tasks, each with an
+  independent spec+quality review; a whole-branch review before merge.