Realign template-managed files with the project template

[timkpaine]

The readiness passes edited lines that the project template (python-project-templates/base at the pinned commit) renders, which every later copier update would fight. This restores those lines to what the template renders with this repository's answers:

• README.md back in the push paths-ignore of the workflow(s). Pull requests never had that filter, so CI on PRs is unchanged.
• The classifier list as the template renders it for the configured primary Python version.
• [tool.coverage.run] omit as rendered, where the pass had emptied or removed it.
• Makefile recipe comments as rendered, where the pass had reworded them.

Left as they are, on purpose, because they do something the template does not: make checks running check-types (the type check is clean here and belongs in the gate; the right home for that line is the template), and the ARG lint rules from the earlier lint pass. Repository-specific content (dependencies, entry points, hatch settings, CI steps that install tools or authenticate private dependencies) is not template-managed and is untouched.

[github-actions]

Test Results

43 tests  ±0   43 ✅ ±0   0s ⏱️ ±0s
 1 suites ±0    0 💤 ±0 
 1 files   ±0    0 ❌ ±0 

Results for commit dc99355. ± Comparison against base commit 9540d4c.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.32%. Comparing base (9540d4c) to head (dc99355).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #66   +/-   ##
=======================================
  Coverage   94.32%   94.32%           
=======================================
  Files           6        6           
  Lines         581      581           
  Branches       47       47           
=======================================
  Hits          548      548           
  Misses         29       29           
  Partials        4        4           

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