Add aiXamine evaluator org, family, and 9 service composites

[fatihdeniz]

Registers aiXamine (aixamine.qcri.org, paper) as an evaluator so its EEE records resolve to real entities.

• seed/orgs.yaml — aixamine org (tags: ["academic","evaluator"])
• seed/families.yaml — aixamine family grouping the 9 service leaderboards
• seed/composites.yaml — 9 aixamine-<service> composites mapping each source_config

Seed-only (+91 lines). seed --local ingests cleanly; gate suite passes (the one failure is an unrelated models.dev drift check).

[borgr]

Verified locally against current main and I recommend merging.

Ran the same steps the dry-run job runs, on main + this branch:

rm -f fixtures/*.parquet && LOCAL_MODE=true uv run eval-card-registry seed --local
LOCAL_MODE=true uv run pytest

Result: 1 failed, 868 passed. The single failure is test_refresh_modelsdev_dedup.py::test_noncatalog_regen_is_confluent_with_committed, which is a pre-existing break on main — tests/fixtures/modelsdev_api.snapshot.json has not moved since 923986e while seed/models/sources/models_dev.generated.yaml has been refreshed six times since, most recently d608d6b. Unmodified main gives the identical 1 failed, 868 passed, so this branch adds no failure. Fixing it means re-pinning the snapshot, which is separate work.

The content reads clean to me. One evaluator org, one family, nine service composites each with a single config and a category/tags pair that matches what the service measures. Additive only, no existing entry touched.

Worth landing this together with the adapter in evaleval/every_eval_ever#283, since that adapter's records resolve against these entities.