Three live-NAS observations that the 0.4.2 implementation got wrong:
1. Header showed "?:?" — DSM Image/get returns image="" and tag=""
for name:tag lookups; the response fields are unreliable. The
header now echoes the user-supplied image_id, falling back to the
sha256 id only when image_id itself is empty.
2. Ports printed as raw Python dicts ({'port':'22','protocol':'tcp'}).
The ports array is a list of {port, protocol} objects — each entry
now renders as "22/tcp".
3. Environment printed as raw Python dicts ({'key':'PATH','value':...}).
The env array is a list of {key, value} objects — each entry now
renders as "PATH=/usr/local/...".
cmd, entrypoint, and volumes (plain string arrays) were already
correct and are untouched. Tests updated to match the live shape;
two new tests guard the header fallback. References #4 (already
closed by 0.4.2 — no need to reopen for a rendering polish).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
marcus
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