chore!: relicense edify from Apache 2.0 to MIT (#273)

Relicenses edify from Apache 2.0 to the MIT License across every
artifact that names or ships it. Sole-copyright-holder relicense — no
CLA sweep needed.

## Landings

- **`LICENSE`** — the Apache 2.0 text is replaced with the standard MIT
text, copyright line `Copyright (c) 2022-2026 Bobby` frozen as a static
literal through the first MIT release.
- **`pyproject.toml`** — the SPDX `license = "…"` field switches from
`Apache-2.0` to `MIT`. `license-files = ["LICENSE"]` continues to attach
the license file to the wheel and sdist via hatchling's Core Metadata
2.4 emission.
- **`README.rst`** — the license section reads "MIT License" and
continues to link the repo's `LICENSE`. The shields.io license badge
reads its label from PyPI metadata, so no manual badge edit is needed.
- **`tests/license.test.py`** — two acceptance tests that read the
installed edify metadata via `importlib.metadata`: `License-Expression
== "MIT"` and `Apache` does not appear in any classifier. Guards against
silent backslide in a future dependency update.

The `License :: OSI Approved :: Apache Software License` classifier has
already been absent from `pyproject.toml`'s `classifiers` list since the
toolchain migration; the second acceptance test above pins that state
going forward.

Closes #231
Closes #232
Closes #233
Closes #234
Closes #237

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