[REFACTOR] Rename -core package to -common to remove a source of confusion

[Seth Fitzsimmons (sethfitz)]

Description

As discussed and agreed in the 2026-03-11 / CODING SESH 💻 meeting, this change renames the overture-schema-core package to overture-schema-common.

The purpose of this change is to eliminate a source of confusion caused by overloading the word "core":

• Since early days, the word "core" has been used in Overture to mean that part of the map and its schema that is of central importance and not peripheral.
• However, in the overture-schema-core package, the word "core" was being used in a different sense to mean basically shared types that are common to more than one theme schema.

This issue has produced real confusion and consumed many minutes of unproductive discussion in meetings. It is hoped this change will eliminate the confusion going forward.

This recreates #520, which was merged but did not land on dev. Rebased onto current dev (which includes the entry-points discovery refactor in #463), so discovery references in this commit resolve to overture.schema.system.discovery rather than the moved-and-renamed overture.schema.common.discovery.

Related

• Closes Rename overture-schema-core package to overture-schema-common #521.
• Agreed in 2026-03-11 / CODING SESH 💻
• Supersedes [REFACTOR] Rename -core package to -common to remove a source of confusion #520

Testing

$ make check

[github-actions]

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