ifc-properties 0.2.1

Property sets, quantities, and unit resolution. No geometry.
Documentation 
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# ifc-properties unit plan

Status: planned under `PROP-UNIT`. Last updated: 2026-08-19.
Follow `AGENTS.md`; claim one task and record blockers/decisions beneath it.

## Work queue

- [ ] `UNIT-SI` - SI prefix and dimensions
  - Proof: view/invalid/cycle tests plus crate clippy.
- [ ] `UNIT-CONV` - conversion-based units/chains
  - Proof: view/invalid/cycle tests plus crate clippy.
- [ ] `UNIT-DERIVED` - derived unit elements/dimensions
  - Proof: view/invalid/cycle tests plus crate clippy.
- [ ] `UNIT-ASSIGN` - project defaults and local override resolution
  - Proof: view/invalid/cycle tests plus crate clippy.
- [ ] `UNIT-CYCLE` - conversion cycle/budget tests
  - Proof: view/invalid/cycle tests plus crate clippy.

## Completion log

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