Document v1.3.0 session learnings in CLAUDE.md

- Updated PHP requirement from 7.4 to 8.3 in compatibility notes
- Added Session History section documenting v1.3.0 release session
- Documented key learnings about license client integration

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

CLAUDE.md

@@ -1101,8 +1101,8 @@ if (!empty($tiers)) {
 
 ### PHP
 
-- Minimum: 7.4
-- Uses modern PHP features (type hints acceptable in new code)
+- Minimum: 8.3 (breaking change in v1.3.0)
+- Uses modern PHP features (type hints, named arguments, etc.)
 - Composer autoloader handles namespacing
 
 ### Browsers
@@ -1138,4 +1138,44 @@ The plugin architecture is solid and well-tested. Most bugs arise from:
 
 ---
 
+## Session History
+
+### v1.3.0 Release Session (2026-01-25)
+
+**Accomplished:**
+
+1. Fixed known bugs from CLAUDE.md:
+   - Removed all releases from git tracking (`git rm --cached -r releases/`)
+   - Deleted all MD5 checksum files, keeping only SHA256
+   - Updated `.gitignore` to exclude `/releases/`
+
+2. Implemented v1.3.0 features:
+   - Bumped PHP requirement from 7.4 to 8.3 (breaking change)
+   - Added PHP version check with admin notice for incompatible servers
+   - Added `magdev/wc-licensed-product-client` library integration
+   - Refactored settings page to use WooCommerce modern sub-tabs pattern (`get_own_sections()`)
+   - Created "General" and "License" sub-tabs
+   - Implemented license management with AJAX validation/activation
+   - Added license status caching via WordPress transients
+   - Added CSS styling for license status display
+
+3. Updated all translation files:
+   - Added 28 new translation strings for license management
+   - Updated .pot template and all 7 .po files
+   - Compiled all .mo files
+
+4. Created release package:
+   - Package size: 737KB (increased due to new dependencies)
+   - 642 files included (more due to license client library)
+   - SHA256 checksum generated
+
+**Key Learnings:**
+
+- WooCommerce settings sub-tabs use `get_own_sections()` and `get_settings_for_{section}_section()` pattern
+- License client library `magdev/wc-licensed-product-client` is from private Gitea repo - requires `repositories` config in composer.json
+- Package version was `^0.1` not `^1.0` - always check available versions before setting constraint
+- Release package size increased from ~430KB to ~737KB due to new Composer dependencies
+
+---
+
 Always refer to this document when starting work on this project. Good luck!