ci: refuse a Package API exemption in an official Package

[Mathih13]

An official Package should call Core only through the Package API. playerbots and dungeons now carry zero // package-api: exempt lines, but nothing kept the count at zero. Core's lint accepts an exemption, so a new one would pass review unnoticed.

This adds a package-api-exemptions job to core-tip.yml. It runs git grep for package-api: exempt over every file in a visible top-level directory, which is every Package including its testsuite. Any match fails the job. A git grep error fails it too. The job needs no Core checkout and runs on every push and PR. The full-ci gating of the bot suites is unchanged.

Verified locally: the check passes on main. With // package-api: exempt test appended to playerbots/src/acceptance_fixture.rs, it fails and prints that line.

Pairs with LyraCoreProject/LyraCore#632, which adds the Core side: a tripwire against Package names in Core source, and a Core CI job that builds the Module with these Packages. Neither PR depends on the other to pass.

Claude Opus 5.5 made these changes through Claude Code.

🤖 Generated with Claude Code

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