docs: Update CLAUDE.md with Issue #5 completion

- Mark Issue #5 (Temperature Ranges) as complete
- Add Issue #6 (Spool Adjustment History) as next up
- Document implementation details for Issue #5

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CLAUDE.md

@@ -130,8 +130,8 @@ This is a fork with UX improvements. Issues are tracked on the Gitea instance ab
 | 2 | Smart Density Defaults | ✅ DONE |
 | 3 | QR Code Sizing Fixes | ✅ DONE |
 | 4 | Layout Max-Width | ✅ DONE |
-| 5 | Temperature Ranges | 🔄 NEXT |
+| 5 | Temperature Ranges | ✅ DONE |
-| 6 | Spool Adjustment History | Open |
+| 6 | Spool Adjustment History | 🔄 NEXT |
 | 7 | 3dfilamentprofiles Integration | Open |
 
 ### Issue #1 Complete - Inline Creation Modals
@@ -182,12 +182,29 @@ Changes:
 - Added 800px max-width for forms via CSS override in `overrides.css`
 - Content is centered on wide screens
 
-### Issue #5 Next - Temperature Ranges
+### Issue #5 Complete - Temperature Ranges
+
+Store extruder and bed temperatures as min/max ranges:
+- Added 4 new DB columns: `settings_extruder_temp_min/max`, `settings_bed_temp_min/max`
+- Old single-value columns kept for backward compatibility (deprecated)
+- Alembic migration copies existing values to both min and max
+- Frontend uses Space.Compact with min/max input pairs
+- Label template shows ranges: "ET: 190-220 °C"
+
+Files:
+- `spoolman/database/models.py` - New columns
+- `migrations/versions/2025_01_15_0200-*.py` - Migration
+- `spoolman/api/v1/models.py`, `filament.py` - API changes
+- `client/src/pages/filaments/create.tsx` - Form updates
+- `client/src/pages/printing/spoolQrCodePrintingDialog.tsx` - Template tags
+
+### Issue #6 Next - Spool Adjustment History
+
+Track history of all spool weight adjustments with timestamps and comments.
 
 Plan:
-- Convert single temp values to min/max ranges for better label printing
+- New table `SpoolAdjustment` with: spool_id, timestamp, type, value, comment
-- Add new database columns: `settings_extruder_temp_min/max`, `settings_bed_temp_min/max`
+- Relationship to Spool model with cascade delete
-- Create Alembic migration to handle data migration
+- API endpoint to list adjustment history
-- Update API models and endpoints
+- Optional comment field in use/adjust endpoints
-- Update frontend forms to use range inputs
+- Frontend: History section in spool show page
-- Update label template to show ranges like "190-210°C"