v0.9.0 — Two-pass layout sizing and ISO 128-44 section arrows

v0.9.0 — 2026-06-13

Two-pass layout sizing (#131) and ISO 128-44 section arrows (#134):
bore callout widths are now estimated from hole geometry before view
positions are fixed, eliminating overflow of callout labels into adjacent
views and extension lines. Section A–A cutting-plane indicators now carry
proper ISO 128-44 wing stubs and open arrowheads.

Added

• Two-pass layout (#131): _measure_strips() estimates bore callout widths and step-dimension depth before choose_scale() fixes the inter-view corridors. Introduces StripDepths dataclass and _est_bore_callout_width(). Eliminates the hard-coded 18 mm floor that caused labels to overflow on wide callouts (e.g. "4× ⌀15.9 THRU" = 23.4 mm on CTC-03). Also fixes the razor-fit pv_below strip (#130) and supersedes the old ad-hoc corridor widening (#103).
• ISO 128-44 section end arrows (#134): perpendicular wing stubs and open 2-barb arrowheads at both ends of the SECTION A–A cutting-plane indicator on the plan view, pointing in the direction of view.

Fixed

• Bore callout shafts (#127): leaders no longer cross the view boundary when no section line is present; elbow offset is zero in that case.
• Plan-view callout / dim_locy collision: bore callout labels that would overlap with dim_locy extension lines are reassigned to the left strip.
• BoltCircle suffix in width estimate: "EQ SP ON øD BC" suffix (~34 mm) is now included in _est_bore_callout_width, preventing underestimated gaps for bolt-circle parts.
• _fmt() float noise (#133): near-integer floats from STEP-imported bounding boxes (e.g. 800.0000000000001) now round to "800" instead of "800.0".
• PMI presentation geometry: non-solid annotation curves from AP242 STEP files are stripped at load time, eliminating phantom lines in all drawing views.