check-image-pins.py now refuses a QUOTED `"image":` key (was not read at
all), an interpolated `${APP_IMAGE:-nginx}` ref (the tag cannot be read),
and `@sha256:` with no 64-hex digest behind it (the label of a pin). It
takes --root=<dir> (the decoy seam) and accepts the runner's --all.
test_gate_decoys.py: 17 image-pins cases — nine facts that must be
refused (untagged, a registry port read as a tag, quoted/capital :latest,
:edge, a comment claiming a pin, the quoted key, interpolation, a fake
digest), seven inert/genuine shapes that must pass, and the real catalog.
COVERS gains "image-pins".
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS
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