The agent container (CUDA base, Python 3.10) crashed on startup with
`NameError: name 'Config' is not defined` — an earlier `ruff --fix` unquoted the
`from_env(cls) -> Config` self-reference, which is safe on CI's Python 3.14
(PEP 649 lazy annotations) but is evaluated at class-definition time on 3.10.
CI lint/compile run on 3.14, so it slipped through.
- config.py: `from __future__ import annotations` so the self-referential
annotation is a string, never evaluated — works on 3.10 and every version.
- agent/ruff.toml: pin the agent to `target-version = "py310"` (its real runtime)
and inherit the root rules. Ruff now flags exactly this class as F821, so CI's
lint lane catches it instead of shipping a broken image. (CI otherwise lints on
3.14, masking 3.10 issues.)
- client.py: submit path now retries in-place. A dedicated session with a
urllib3 Retry (connect/read/status, 0.5s backoff, 500/502/503/504, POST) so a
momentary blip after the GPU work is done doesn't discard it and force a full
re-download + recompute elsewhere. A duplicate submit after a lost response is
a harmless 409 no-op. Lease/fetch keep the plain session + loop-level backoff.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ttrj5P7upUTueSfoJcxEqa
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