stop-turn-feedback: BLOCKED � turn-end lint check failed across 1 dirty Python file(s).

What failed:
F401 [*] `os` imported but unused
 --> demo_violation.py:1:8
  |
1 | import os
  |        ^^
  |
help: Remove unused import: `os`

Found 1 error.
[*] 1 fixable with the `--fix` option.

Why this is forbidden: gzkit forbids ending a turn while the cheap deterministic tier is red (AGENTS.md Behavior Rules � Never #5; ADR-0.0.70 turn-end feedback; .gzkit/rules/guardrail-feedback-prose.md).

Governed next step: fix the findings above, verify with `uv run ruff check <files>`, then end the turn. One block per turn � the next stop proceeds even if findings remain (fail-open).
