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chore: post-merge hardening, docs, coverage, and 2.1.0 version

Follow-up to #20 (SE gamma fix) and #21 (n_grid), landing changes that
weren't part of either contributor PR:

- base.py: n_grid < 2 now raises ValueError (was a degenerate grid);
  validated before the empty-t early return. Document n_grid on cum()
  and the sibling volume methods (were stale "currently unused"); pass
  **kwargs through monthly_vol_equiv's prepend for consistency.
- test/test_perf.py: add coverage for the n_grid guard and the SE
  small-n gamma-overflow fallback path.
- docs/versions.rst: 2.1.0 entry (SE fix flagged as a breaking numerical
  change; n_grid; THM cleanup).
- docs/numerical_integration.rst + integration_validation.py: n_grid
  convergence analysis (second-order; 10k -> ~2e-6, 2000 -> ~5e-5),
  SE small-n fallback note, print_ngrid_convergence().
- ci.yml + pyproject.toml + .gitignore: upload coverage to Coveralls via
  coverallsapp/github-action (ubuntu/3.12 cell, continue-on-error).
- Bump version 2.0.0 -> 2.1.0.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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