official Packages: add the reference Package and core-tip compatibility CI #305

This was generated by AI during triage.

Agent Brief

Category: enhancement
Summary: Populate the new Official Package Collection with a reference Package and compatibility CI.

Current behavior:
The organization repository does not exist yet. Once a human creates it, it will have no tested Package convention.

Desired behavior:
Add one small reference Package in a top-level directory. CI checks out LyraCore at current main, installs or mounts the reference through the supported Package workflow, and compiles and tests it against core tip. The reference demonstrates the supported Package shape without private content.

Key interfaces:

• Official Package Collection top-level directory convention
• Reference Package
• Core-tip compatibility workflow

Acceptance criteria:

• The repository has at least one independently installable top-level Package.
• CI compiles every top-level Package against LyraCore main.
• A core schema or Package API incompatibility fails CI.
• The reference contains no private Package source or client binaries.
• CI documents any cross-repository authentication it requires.

Out of scope:

• Creating the organization repository or setting its permissions
• Moving playerbots or dungeon content