fix(calibrate): disclose Kendall-tau reuses kappa's Landis-Koch cutoffs#1
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The τ band_basis claimed "heuristic strength bands (NOT Landis-Koch)", but the band was computed by the same landis_koch_band() that κ uses — the exact Landis-Koch cutoffs. The label denied what the code did, contradicting the repo's own no-over-claiming thesis. Fix the disclosure to match the code rather than invent a second arbitrary τ scale (which would be less honest, not more): τ has no established band standard, so the tool reuses κ's cutoffs as a DISCLOSED heuristic and says so. - rename landis_koch_band() -> strength_band() (metric-agnostic; docstring explains κ=standard vs τ=disclosed-heuristic) - τ band_basis now: "tool heuristic: reuses the Landis-Koch kappa cutoffs (tau has no established band standard, so treat the label as rough)" - flip test_parity's τ test from pinning the false "NOT Landis-Koch" claim to pinning the honest reuse disclosure - sync README + CHANGELOG wording Tests: 43 passed, 1 skipped. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Relabels the tau band_basis to match the code: tau has no established band standard, so it reuses kappa's Landis-Koch cutoffs as a
disclosed heuristic. Tests: 43 passed, 1 skipped.