tq-threads v0.3.0 — augers, Phillips drives, custom profiles & child wrappers

v0.3.0 makes tq-threads a stronger practical replacement for general OpenSCAD thread libraries — all clean-room, still MIT.

New

• Custom flank angle, explicit tooth_height, and taper (NPT-ish / auger tips) on tq_thread
• tq_auger / tq_auger_hole — deep coarse helical flight + negative
• Phillips drive: tq_phillips_drive, tq_phillips_tip, and drive="phillips" on bolts
• Child-difference wrappers: tq_tap, tq_drill, tq_counterbore, tq_countersink
• tq_relief_groove (thread runout)

Dev UX

• scripts/render-tests.ps1 now runs on Windows PowerShell 5.1 (no PS7-only syntax) and prefers openscad.com on Windows
• New helpers covered by fast/heavy tests, examples, README, MANUAL, REFERENCES

Backward compatible: default angle=60 matches v0.2 bit-for-bit. See CHANGELOG.