tq-threads v0.4.0 — ISO 965 fit classes, 101 presets, provenance & robust proof

v0.4.0 sharpens standards fidelity + honesty and hardens the Windows workflow. Clean-room, MIT.

New

• ISO 965-1 fit= tolerance position (allowance) — exact formulae, separate from FDM clearance
• minor_d core-diameter override; presets 43 → 101 (full ISO 261 fine + Unified #0–#12 + ¼–1″ UNC/UNF)
• tq_preset_count() / tq_presets_selfcheck(); tq_threads_selftest.scad standards-table asserts
• Wood-screw params (taper/core_d/thread_depth/point/shank) and bottle-thread params (angle/tooth_height/profile/lead_in) — still generic, no standard claimed
• Robust example selection: zero--D examples/*.scad wrappers + numeric -D PART=n
• scripts/render_proof.ps1: PASS/FAIL, version+timings, 13 negative tests, exits nonzero (PS 5.1 + pwsh)
• REFERENCES.md §0 fidelity table + PROVENANCE.md (EXACT/DERIVED/FDM/APPROX); ACCEPTANCE-REPORT-v0.4.0.md

Honesty: printable-first, not metrology-grade (single nominal surface; models the tolerance position, not the grade/band). Backward compatible: default angle=60 keeps v0.2/v0.3 geometry bit-for-bit.

Proof: 27/27 (14 render + 13 negative), OpenSCAD 2021.01. See CHANGELOG + acceptance report.