future-plans: measurement dimensions and unit conversion

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

future-plans.md

@@ -126,6 +126,19 @@ Currently all field values are free-text strings. Typed fields (numeric,
 enum/dropdown) would enable better formatting, validation, and range-aware search.
 Prerequisite for parametric search with range operators.
 
+#### Measurement dimensions and unit conversion
+Instead of a bare unit string on a field, associate a field with a measurement
+dimension (e.g. `temperature`, `resistance`, `frequency`, `voltage`). The dimension
+defines the set of valid units and the conversion factors between them (°C, °K, °R,
+°F for temperature; Ω, kΩ, MΩ for resistance; etc.).
+
+This would allow:
+- Entering values in any compatible unit and storing in a canonical unit internally
+- Displaying in the user's preferred unit
+- Parametric search with cross-unit comparisons (e.g. `temp_range > 200K` matching
+  a component with `temp_range = -73°C`)
+- Catching unit mismatches at entry time
+
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