Show coat of arms as AdminUnit depiction consistently (P94 → foaf:img)

[namedgraph]

Problem

The frontpage AdminUnit grid displayed images inconsistently — some cards showed a county's coat of arms, others a scenery photo. Reconciliation emitted both the coat of arms (Wikidata P94) and a photo (P18) as foaf:depiction, and LDH's ac:image thumbnail selector renders only the first in nondeterministic DESCRIBE order. The view's SELECT can't control it (it's DESCRIBE-wrapped).

Fix

Model the coat of arms on foaf:img instead of foaf:depiction. foaf:img is rdfs:subPropertyOf foaf:depiction ("particularly representative"), and LDH's ac:image ranks foaf:img > foaf:logo > foaf:depiction, rendering the first — so the coat of arms now wins the card image deterministically, while the scenery photo stays a plain foaf:depiction (still shown on the entity's own page).

• Coat of arms (P94) → foaf:img
• Photo (P18) → foaf:depiction
• Logo (P154) → schema:logo (unchanged)
• Persons unaffected — no P94, so their portrait stays foaf:depiction.

Liveness-check bug (found while regenerating)

Commons rate-limits liveness bursts with HTTP 429, which images.reachable() treated as "dead" and stripped live images en masse (10/518 reachable on a naive run). It now retries 429/503 with backoff (honoring Retry-After) at gentler concurrency → 518/518.

Data

Regenerated datasets/current/admin-units/alignments.trig:

• 171 foaf:img (coats of arms) + 374 foaf:depiction (photos) = the same 545 images as before — nothing lost, just reclassified.
• URLs normalized to https:// (the committed file was stale http://, which browsers/GitHub won't render).
• Parses, round-trips base-independently, SHACL conforms.

Notes

• Requires make load (or a reload) for the running LDH to serve the new alignments.
• The foaf:img win also applies to ac:MapMode and the county detail page, so the coat of arms is now the consistent identity image everywhere.
• docker-compose.override.yml had a pre-existing local modification, intentionally left out of this PR.

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