refactor: remove the migrated playtester

[zoeyrose]

Summary

• remove the migrated atrinik_bot implementation from the aggregate tools repository
• remove its content checkout, protocol install, native build, CTest, runtime collection, and Python regression steps from Tools validation
• direct autonomous gameplay work to atrinik/playtester
• retain every unrelated utility, its validation, and the tools repository's GPL licensing

Migration boundary

The exact source boundary was migrated in atrinik/playtester#11. Its destination provenance record links Zoey Rose's direct MIT grant, maps the two retained source commits, and separates external GPL/MIT/content dependency licenses.

No credentials, mutable state, caches, downloaded dependencies, or secret-bearing historical snapshots were part of the migration.

Validation

• python3 -W error -m compileall -q -f .: pass
• map-checker unit tests: 20/20 passed
• pinned map-checker catalog dependency validate/sync/verify: pass
• strict randomizer C build: pass
• actionlint: pass
• git diff --check: pass

Refs #19.