ifc-alignment 0.3.0

IFC4x3 linear positioning: alignments, referents, linear placement, spirals.
Documentation
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# ifc-alignment placement plan

Status: planned under `ALIGN-PLACE`. Last updated: 2026-08-19.
Follow `AGENTS.md`; claim one task and record material decisions beneath it.

## Work queue

- [ ] `APLACE-LIN` - linear placement views
  - Proof: focused valid/invalid/edge fixture tests plus crate clippy.
- [ ] `APLACE-DIST` - point-by-distance expressions
  - Proof: focused valid/invalid/edge fixture tests plus crate clippy.
- [ ] `APLACE-FRAME` - station to neutral frame with budgets
  - Proof: focused valid/invalid/edge fixture tests plus crate clippy.

## Completion log

Append `TASK-ID - proof - material decision`; no long logs.