docs(tools): describe MIT-default license boundary - #69

…#23)

## Summary

- retire the obsolete converter, legacy checker, map-maker, mapset,
randomizer, and world-viewer utilities
- make the repository MIT by default while preserving the complete
`map-checker-qt/` subtree as GPL-2.0-or-later
- preserve historical releases and replace unresolved native diagnostic
bytes with tested current implementations
- publish a privacy-preserving, per-contribution provenance ledger with
exact immutable source and transition coordinates

Delivers [#22](#22)
with companion policy changes in
[atrinik/atrinik#379](atrinik/atrinik#379) and
public wording in
[atrinik/github-settings#69](atrinik/github-settings#69).

## Coordinates

- Base: `main` at `7777cf9f9ab6deb58de8a481dfccd6b05d86e3e1`
- Head: `refactor/mit-default-license` at
`33003ac9f737da9c722b446b6bf4948d669ce42b`
- Tree: `1f84a1d32120fc3f32902c2a9603f7c1730e6034`
- Worktree:
`/workspaces/atrinik/workspace/worktrees/tools/issue-22-mit-default`
- Commits: issue implementation and iterative review fixes from
`3ce48bf` through `33003ac`

## Rights attestation

Zoey Rose (`github:zoeyrose`) attests that she personally authored, or
commissioned and directed as agent-assisted work, every human-authored
contribution admitted to the MIT-default scope by `PROVENANCE.md`; that
she owns the rights needed to license those contributions; and that she
licenses them under MIT. This is an explicit contemporaneous grant, not
an inference from Git identity or tool use. Dependabot substitutions and
minimal diagnostic-contract fragments are separately classified in the
committed ledger.

## Validation

- `python3 -m unittest discover -s tests -v` — 10 passed, including
disposable-ELF behavior, exact-path/symlink/same-inode rejection,
executable/debug hard-link and xattr preservation, compatibility, and
early/late failure rollback
- `python3 -m unittest discover -s map-checker-qt/tests -v` — 20 passed
- `python3 -W error -m compileall -q -f stacktrace.py map-checker-qt` —
passed
- `shellcheck split_symbols.sh` — passed
- `actionlint` — passed for all workflows
- `map-checker-qt/dependencies.py validate`, `sync`, `verify`, and
catalog-only scan against `content@main` — passed
- `split_symbols.sh /bin/true` smoke test — passed
- GPL baseline/current `COPYING` SHA-256 equality —
`d8c320ffc0030d1b096ae4732b50d2b811cf95e9a9b7377c1127b2563e0a0388`
- `git diff --check` — passed

## Merge and publication order

1. Merge this owning tools transition.
2. Merge
[atrinik/atrinik#379](atrinik/atrinik#379).
3. Merge
[atrinik/github-settings#69](atrinik/github-settings#69).
4. Separately authorize and run `bin/publish-community-health --apply`,
then verify the rendered organization profile.
5. After all four preceding steps succeed, a maintainer may separately
complete the issue lifecycle.

No PR in this stack auto-closes the issue. No publish apply is part of
this PR.

## Verification

Runtime verification is not applicable: this repository owns standalone
operator utilities. Historical tags and releases from `v1.0.0` through
`v1.2.6` remain present and unchanged. The root/subtree license boundary
is documented in `README.md`, `LICENSE`, `map-checker-qt/LICENSE`, and
`PROVENANCE.md`.

BREAKING CHANGE: The repository is now MIT by default, while the
complete `map-checker-qt/` subtree remains GPL-2.0-or-later; the
repository archive must not be represented as MIT-only.

## Summary

- represent the complete tools checkout as
`LicenseRef-Atrinik-Tools-Mixed`
- expand that reference into the exact MIT-default and GPL-2.0-or-later
`map-checker-qt/` facts in Markdown, CycloneDX, and SPDX output
- pin the reviewed tools transition revision
`33003ac9f737da9c722b446b6bf4948d669ce42b` and tree
`1f84a1d32120fc3f32902c2a9603f7c1730e6034`
- remove retired PHP/world-viewer dependency evidence, align current
Classic immutable inputs, and synchronize governance, guidance, and
regression coverage

Supports [atrinik/tools#22](atrinik/tools#22)
after the owning transition in
[atrinik/tools#23](atrinik/tools#23). Public
wording follows in
[atrinik/github-settings#69](atrinik/github-settings#69).

## Coordinates

- Base: `main` at `519041ae16eaa87c4f2499a83fbc36c506f3323d`
- Head: `refactor/tools-mixed-license` at
`f4d8c790f69feb51cbc0fa955de79faf4c7201a3`
- Tree: `306ce6892561303962f8db686b472d6fd1103e49`
- Worktree:
`/workspaces/atrinik/workspace/worktrees/atrinik/issue-22-tools-mixed-license`
- Commits: implementation from `a2b56ae49`, latest-main merges, and
iterative pin/fix series through `f4d8c790f`

## Validation

- complete `python3 -m coverage run -m unittest discover -q` — passed on
the merged latest-main graph
- `python3 -m coverage report --show-missing` — passed; total 83%
- focused governance/supply-chain suite — 60 passed
- `python3 -m compileall -q atrinik atrinik_workspace tests` — passed
- `python3 -m atrinik_workspace.guidance_inventory --check` — passed
- `./atrinik manifest validate` — passed
- `./atrinik supply-chain validate` — passed
- `./atrinik supply-chain audit --profile issue-22-tools` — passed
across the complete exact profile
- current Classic dependency-bundle and content-runtime coordinates
reconcile with
`atrinik/classic@fcbb2eaa4d5dd208880a346e865187e01fd0569d`
- license, CycloneDX, and SPDX reports contain the exact mixed-license
expansion and pinned tools revision
- `git diff --check` — passed

## Merge and publication order

1. Merge [atrinik/tools#23](atrinik/tools#23).
2. Merge this coordinator contract.
3. Merge
[atrinik/github-settings#69](atrinik/github-settings#69).
4. Separately authorize and run `bin/publish-community-health --apply`,
verify the rendered organization profile, and only then complete the
issue lifecycle.

No merge, issue closure, or publication apply is performed by this PR.

## Verification

Runtime verification is not applicable: this changes deterministic
manifest, governance, and supply-chain reporting. The reproducible
profile is `issue-22-tools`; generated reports are retained locally
under `build/reviews/` and are intentionally ignored.