refactor!: transition tools to MIT default

[zoeyrose]

Summary

• retire the obsolete converter, legacy checker, map-maker, mapset, randomizer, and world-viewer utilities
• remove the retired randomizer build from Tools validation
• narrow the repository documentation to the retained Qt checker and native diagnostics

The MIT-default license switch and privacy-preserving provenance manifest remain intentionally pending. The issue requires the identity-evidence contract from atrinik/atrinik#378, which is still open without an implementation PR. This draft does not relicense any retained file.

Coordinates

• Issue: Closes Transition tools to an MIT default with a temporary GPL map-checker exception #22
• Base: main at 7777cf9f9ab6deb58de8a481dfccd6b05d86e3e1
• Head: refactor/mit-default-license at 3ce48bfa62edfea491304a5424da71ff2c6b79c3
• Worktree: /workspaces/atrinik/workspace/worktrees/tools/issue-22-mit-default
• Commits: 3ce48bf refactor!: retire obsolete tools

Validation

• python3 -m unittest discover -s map-checker-qt/tests -v — 20 passed
• python3 -W error -m compileall -q -f map-checker-qt — passed
• git diff --check — passed

Verification

Runtime verification is not applicable: this repository owns standalone operator utilities, not a server/client topology. Repeat with:

cd /workspaces/atrinik/workspace/worktrees/tools/issue-22-mit-default
python3 -m unittest discover -s map-checker-qt/tests -v
python3 -W error -m compileall -q -f map-checker-qt
git diff --check

Blocker

• atrinik/atrinik#378 must land before retained files can enter the MIT-default scope and before this draft can complete its provenance/license acceptance criteria.