2.1.0

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,
shipped in
modern-di 2.28.0.
Tenth of 13 planned adapter conversions across the modern-di ecosystem
(after
modern-di-starlette 2.2.0,
modern-di-fastapi 2.10.0,
modern-di-litestar 2.13.0,
modern-di-aiohttp 2.2.0,
modern-di-flask 2.1.0,
modern-di-faststream 2.10.0,
modern-di-typer 2.3.0,
modern-di-grpc 2.1.0,
and
modern-di-celery 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.