refactor(capture): extract shape operation records

[w1ne]

Summary

• extract shape operation record builders and session validation from CaptureSession
• move proxy face-ref helper import to the focused shape-operation module while preserving the CaptureSession re-export
• add selector/spec regression coverage for Query DSL, face wrappers, draft metadata, variable edge groups, and session ownership errors

Verification

• npm test -- tests/unit/capture/shapeOperationFeatureRecords.test.ts tests/unit/capture/proxy.fillet.test.ts tests/unit/capture/proxy.shell.test.ts src/modeling/capture/proxy.test.ts tests/unit/capture/shapeBendCapture.test.ts tests/unit/capture/sketch.test.ts tests/integration/lowering/queryLowererIntegration.test.ts tests/integration/backends/occt/variableFilletFaceWrapper.test.ts tests/unit/backends/occt/draft.test.ts
• npm run typecheck
• npx eslint src/modeling/capture/captureSession.ts src/modeling/capture/proxy.ts src/modeling/capture/shapeOperationFeatureRecords.ts src/modeling/capture/shapeOperationCaptureValidation.ts tests/unit/capture/shapeOperationFeatureRecords.test.ts
• filtered depcruise on shapeOperation* modules: 0 touched violations
• git diff --check

Subagent reviews: architecture/dependency and behavior-regression reviewers reported no findings.