ifc-properties 0.2.1

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

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

## Work queue

- [ ] `QTY-SET` - element quantity and assignments
  - Proof: view/invalid/cycle tests plus crate clippy.
- [ ] `QTY-SIMPLE` - length/area/volume/count/time/weight
  - Proof: view/invalid/cycle tests plus crate clippy.
- [ ] `QTY-COMPLEX` - nested quantities
  - Proof: view/invalid/cycle tests plus crate clippy.
- [ ] `QTY-VALID` - unit/dimension/formula diagnostics
  - Proof: view/invalid/cycle tests plus crate clippy.
- [ ] `QTY-EDIT` - transactionally populate externally computed values
  - Proof: view/invalid/cycle tests plus crate clippy.
- [ ] `QTY-COMPARE` - report authored versus supplied values without geometry dependency
  - Proof: view/invalid/cycle tests plus crate clippy.

## Completion log

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