chore(#118): bump OCCTSwift floor to 3.0.0

[gsdali]

What & why

OCCTSwift v3.0.0 shipped
2026-08-18 with two breaking changes. Selector.SubShapeType.compsolid renamed .compSolid
needed no source change here (this repo already used the surviving ShapeType.compSolid
spelling). Shape.bounds/.size/.center, Wire.bounds, Edge.bounds, Face.bounds became
Optional (they used to fabricate (0,0,0)-(0,0,0) for a shape with no bounding box,
indistinguishable from a genuine zero-size shape at the origin). Every call site here now
unwraps: QueryTopology/LoadBrep/MeasureDeviation/RenderPreview/Metrics throw a named
ScriptError on a nil bounding box; the two recipe edge-selector predicates return false
rather than fabricate a match.

Closes #118

This is not ready to release yet, by design. The rest of the cohort
(OCCTSwiftTools/Mesh/IO/AIS) has not shipped an OCCTSwift-3.0.0-compatible release, and
OCCTSwiftAIS additionally has 3 of its own unfixed .bounds call sites, so CI on this PR is
expected to fail (remote graph resolution) until they catch up — same situation as the 2.0.0
bump (see the new OKF decision entry, occtswift-3.0.0-floor-bump-blocked-on-cohort-releases.md,
for the full detail and how this was verified anyway: a local build with a temporary,
reverted-after-verification patch to the AIS sibling checkout). Merge review doesn't require a
resolvable graph, only the eventual release tag does.

Checklist

• New or changed behavior is covered by a unit test in the same PR:
  Tests/OcctkitCommandTests/OptionalBoundsTests.swift constructs a genuinely void shape
  (the intersection of two disjoint boxes) and asserts the new throw paths fire instead of
  fabricating a zero-size box.

Notes for the reviewer

• swift build, swift build --build-tests, swift test (12/12), and
  Scripts/recipe-check.sh against a release build (all 7 recipes match their reference
  output.brep exactly, Δvol 0.00e+00) all verified clean locally against the real v3.0.0
  OCCTSwift sibling checkout.
• Package.resolved is intentionally left untouched, matching the Bump OCCTSwift floor to 2.0.0 #111 precedent: regenerating
  it now would either commit path-relative local-machine state or fail outright against remote.
• Do not merge-and-tag a release until the cohort (Tools/Mesh/IO/AIS) ships its own 3.0.0-era
  repin — tracked in the OKF decision entry linked above.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (14 files)

• CLAUDE.md - Documentation updated for OCCTSwift 3.0.0 floor
• Package.swift - Dependency bumped from 2.0.0 to 3.0.0 with detailed rationale
• Sources/occtkit/Commands/LoadBrep.swift - Added nil check for shape.bounds, throws ScriptError
• Sources/occtkit/Commands/MeasureDeviation.swift - Added nil check in defaultDeflection, throws ScriptError
• Sources/occtkit/Commands/Metrics.swift - Added nil check for shape.bounds, throws ScriptError
• Sources/occtkit/Commands/QueryTopology.swift - Added nil checks for face.bounds and edge.bounds, throws ScriptError
• Sources/occtkit/Commands/RenderPreview.swift - Added nil check for shape.bounds, throws ScriptError
• Tests/OcctkitCommandTests/OptionalBoundsTests.swift - New regression test for void shape bounds handling
• okf/decisions/concave-edge-classifier-can-select-wrong-edges.md - Added note about OCCTSwift 3.0.0 bounds change
• okf/decisions/index.md - Added reference to new decision entry
• okf/decisions/occtswift-3.0.0-floor-bump-blocked-on-cohort-releases.md - New decision documenting cohort blocker
• okf/log.md - Log entry for the bump
• recipes/01-mounting-bracket/main.swift - Fixed edge selector to handle optional bounds
• recipes/03-pipe-flange/main.swift - Fixed edge selector to handle optional bounds

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_{Reviewed by nemotron-3-ultra-550b-a55b:free · Input: 190.7K · Output: 10.6K · Cached: 397.4K}