[50 MRG] Accessories: ear/hat anchor improvements — 3 catalog SKUs

[laurentketterle-hub]

Accessories: Ear/Cap Anchor Improvements

Adds earring and cap accessory SKUs with proper anchor placement for BeeAR virtual try-on.

New Catalog Entries

1. earring_hoop_gold.json — Gold hoop earring, ear_lobe anchor, -12mm Y / +8mm Z offset
2. earring_stud_silver.json — Silver stud earring, ear_lobe anchor, -8mm Y / +6mm Z offset
3. cap_baseball_navy.json — Navy baseball cap, head_top anchor, +4mm Y offset

Anchor Placement

Each accessory specifies:

• anchor: anatomical reference point (ear_lobe, head_top)
• offset_mm: precise 3D positioning relative to anchor
• scale: uniform scaling factor for size adjustment
• model_path / texture_path: 3D model and texture assets

CI

Added GitHub Actions CI (pytest on Python 3.10/3.11/3.12)

Closes #12

How to test

python -m pytest tests/
python -c "import json; d=json.load(open('catalog/earring_hoop_gold.json')); assert d['type']=='accessory'"

Claim

I claim this bounty for MergeOS MRG.

[laurentketterle-hub]

/attempt 12

[laurentketterle-hub]

Friendly ping 👋 — this PR has been open for 4 days. Is there anything needed for review? Thanks!