Rollout hygiene: run package doctests in CI, modernize packaging metadata, add .editorconfig

[thorwhalen]

Hygiene pass from the fleet-wide wads repo-improvement rollout. This repo was
already on the modern uv-stub CI and green, so nothing here migrates or
restructures anything — it closes the metadata/config gaps that
python -m wads.repo_audit flagged, one dimension per commit.

What changed

1. testpaths — the real fix in this PR

wads CI runs pytest --doctest-modules with no path argument, so what gets
collected is decided entirely by testpaths. With testpaths = ["tests"], the
package's own doctests were never collected — CI reported green while doctesting
nothing in flaskstream2py/. That failure mode never announces itself.

testpaths now includes the package directory as well.

Doctest collection, before → after:

	package doctests collected	total items
before	0	1
after	1	2

The newly-collected item is
flaskstream2py/flask_request_reader.py::flaskstream2py.flask_request_reader.FlaskRequestReader
(the class docstring's Flask-route example). It passes — verified locally and
confirmed in this branch's CI log:

collected 2 items
tests/test_smoke.py::test_import PASSED                                  [ 50%]
flaskstream2py/flask_request_reader.py::...::FlaskRequestReader PASSED   [100%]
2 passed in 0.38s

No latent bug was surfaced by turning it on.

2. Packaging metadata ([project])

• licence: the deprecated [project.license] text = "Apache-2.0" table
  became the PEP 639 SPDX string license = "Apache-2.0", matching the repo's
  actual Apache License 2.0 LICENSE file, plus license-files = ["LICENSE"]
  so the licence ships inside the wheel. Deliberately no
  License :: OSI Approved :: ... classifier: hatchling ≥ 1.27 rejects a licence
  classifier that coexists with an SPDX expression.
• classifiers (11, all validated against trove-classifiers): Development
  Status 3 - Alpha — the README calls this a WIP library and the version is
  0.1.6, so maturity is not overstated. Python 3.10/3.11/3.12 only:
  requires-python is >=3.10 and the CI matrix tops out at 3.12, so 3.13 is
  not claimed as supported. Framework :: Flask,
  Topic :: Internet :: WWW/HTTP and
  Topic :: Software Development :: Libraries :: Python Modules describe what
  the package actually is; Operating System :: OS Independent is backed by CI
  running the Windows job too.
• keywords (7): derived from the README and the public API — a stream2py
  SourceReader that reads an incoming Flask request body in chunks.
• project.urls: added Documentation (the live GitHub Pages site, verified
  reachable), Repository and Issues next to the existing Homepage.
• description, readme and requires-python were already present and
  accurate; left as-is. authors is still empty and was left alone on purpose —
  the repo has more than one contributor, so populating it is the maintainer's
  call, not a mechanical fix.

Verified locally: uv build produces a clean sdist + wheel and twine check
passes both. The resulting wheel metadata carries
License-Expression: Apache-2.0 and License-File: LICENSE.

3. .editorconfig

Added the standard fleet file (copied verbatim from a healthy sibling repo).
No existing file was reformatted.

Untouched on purpose

[tool.ruff] was already configured and is unchanged. No new tests, no
py.typed, no CHANGELOG, no code restructuring, no wholesale reformatting —
all out of scope for this pass.

Verification

• Local dependents gate (priv test-dependents flaskstream2py):
  baseline 1 suites: 1 pass, 0 fail → final 1 suites: 1 pass, 0 fail.
  No regression, and the final run is strictly stronger since it now includes
  the package doctest.
• Branch CI: https://github.com/i2mint/flaskstream2py/actions/runs/30860580517
  — success. Read Configuration ✅, Validation 3.10 ✅, Validation 3.12 ✅,
  Windows Tests ✅. Publish and Publish GitHub Pages correctly skipped
  (branch build, not the default branch).
• ruff check flaskstream2py and ruff format --check . are both clean.

Left undone

• The repo ships no agent skills (skills/, .claude/skills/,
  flaskstream2py/data/skills/) — that is the wads-skillify dimension and was
  out of scope here.
• docsrc/conf.py trips ruff D100 when linting the repo root. Harmless: CI
  scopes ruff check to the package directory, so it never sees that file.
• authors = [], as noted above — needs a maintainer decision.

⚠️ Merging this publishes a release

[tool.wads.ci.publish] is enabled for this repo, so merging to master will
run the publish job and push a new version of flaskstream2py to PyPI (current
published version: 0.1.6). Nothing in this PR changes the package's behaviour or
its dependencies — the only functional difference is that CI now executes one
more (passing) doctest. Merge when you are happy to ship a metadata-only release.

Opened by the rollout agent and deliberately left open for maintainer review.