Fix `resource.path` to be spec-compliant

[dsmedia]

The datapackage.json uses non-standard paths that fail validation with standard Data Package tools (frictionless-py, frictionless-ts).

Current vs Expected

Field	Current	Spec-compliant
resource.path	airports.csv	data/airports.csv

Per the Data Package spec, paths must be relative to the descriptor file. Since datapackage.json is at the repo root and data files live in data/, the path should include the subdirectory.

Blocked

This change will break Altair's URL construction. Backwards-compatible path handling has been raised as an issue.

Blocked by: vega/altair#3946

Related

• feat: improve Data Package metadata compliance with CKAN licenses and field schemas #755 — broader Data Package compliance work