Tags: sylam/derivus

Package correctly for PyPI and add the publish workflow

Building the wheel rather than reading setup.py surfaced three defects that
would each have shipped broken:

- All three console scripts were dead. find_packages() shipped only the
  derivus package, but the entry points target flat modules beside it, so
  bootstrap/derivus_batch/derivus_docs were absent from the wheel entirely.
  Declared them via py_modules.
- DV_Docs had no main() to call, only an __main__ block. Extracted one to
  match derivus_batch/derivus_bootstrap, and rooted it at cwd: installed as
  a console script the module lives in site-packages, which has no docs_src.
- pyparsing (config.py) was undeclared and only arriving as a transitive
  dependency of matplotlib, which nothing shipped actually imports.

Dependencies now state what the package imports. matplotlib moves to
[interactive]; python-markdown-math is dropped as stale (it provides
mdx_math, referenced nowhere — the generated config uses pymdownx.arithmatex
with the material theme) and the real docs toolchain becomes a [docs] extra.

Also: rename bootstrap.py -> derivus_bootstrap.py so installing does not drop
a generically-named module into site-packages, stop shipping excel_integration
as an importable top-level package, and correct the README, which claimed
Derivus was not on PyPI and required python >= 3.6 against setup.py's >= 3.8.

Version 0.4.2: the previous 0.4.2.alpha normalises to a pre-release, which
pip skips unless asked with --pre.

Publishing uses OIDC trusted publishing, no stored token. The upload job is
separate so it alone holds id-token: write, and is gated on the tag matching
derivus/_version.py, the CLI modules being present in the wheel, and
twine check --strict.

Verified: wheel installed into a clean venv loads all three entry points,
imports from a non-repo cwd, and builds docs from a checkout. Suite 570
passed, 3 xfailed.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>