fix(core): ship the licence inside the wheel

[Abdeali099]

Found while opening the actual v0.1.0 wheel to see what's in it: there's no LICENSE inside.

docsigner_core-0.1.0.dist-info/METADATA
docsigner_core-0.1.0.dist-info/WHEEL
docsigner_core-0.1.0.dist-info/top_level.txt
docsigner_core-0.1.0.dist-info/RECORD

Apache-2.0 asks for the licence and the NOTICE to travel with the code. Ours sit at the repo root, outside core/, and packaging tools can't reach above the project directory — so they were silently dropped from every build. host/'s packaging already copies both into its archive for exactly this reason; core/ never did.

The fix

core/ keeps its own copies, declared in pyproject.toml:

license-files = ["LICENSE", "NOTICE"]

That's a copy, and copies drift. So test_docs.py — which already exists to catch things that rot silently — now fails if either stops matching the root:

core/NOTICE has drifted from NOTICE at the repo root. Copy the root one over it.

Verified by building it

Not asserted from the docs — I built the wheel and looked:

docsigner_core-0.1.0.dist-info/licenses/LICENSE
docsigner_core-0.1.0.dist-info/licenses/NOTICE

License-Expression: Apache-2.0
License-File: LICENSE
License-File: NOTICE

The License-Expression line also confirms the setuptools>=77 bump from PR #9 is doing its job — older setuptools would emit the legacy free-text License: field instead.

And the drift test earns its place: appending a line to core/NOTICE fails it, restoring it passes. pytest core/tests is 126 (was 124).

Note on timing

0.1.0 is already published on the release page, and you're about to upload it to PyPI. That upload will not have the licence in it — the fix lands in 0.1.1, whenever core/ next changes. Not worth burning a version over; PyPI shows the licence in the metadata and links to the repo either way.

Not merged, as asked.