chore: prepare release 2.9.0

RELEASE_NOTES_TEMPLATE.md

@@ -1,36 +1,16 @@
 # MTG Python Deckbuilder ${VERSION}
 
 ### Summary
-New card browser for exploring and discovering cards with advanced filters, similar card recommendations, and fast performance.
+_No unreleased changes yet_
 
 ### Added
-- **Card Browser**: Browse and search all 29,839 Magic cards at `/browse/cards`
-  - Smart autocomplete with typo tolerance for card names and themes
-  - Multi-theme filtering (up to 5 themes)
-  - Color, type, rarity, CMC, power/toughness filters
-  - Multiple sorting options including EDHREC popularity
-  - Infinite scroll with shareable URLs
-- **Card Detail Pages**: Individual card pages with similar card suggestions
-  - Enable with `ENABLE_CARD_DETAILS=1` environment variable
-  - Full card stats, oracle text, and theme tags
-  - Similar cards based on theme overlap with color-coded scores
-  - Card preview on hover
-- **Similarity Cache**: Pre-computed card similarities for instant page loads
-  - Build cache with `python -m code.scripts.build_similarity_cache_parquet --parallel`
-  - Control with `SIMILARITY_CACHE_ENABLED` environment variable
-- **Keyboard Shortcuts**: Quick navigation
-  - `Enter` to add autocomplete matches
-  - `Shift+Enter` to apply filters  
-  - Double `Esc` to clear all filters
+_None_
 
 ### Changed
-- **Card Database**: Expanded to 29,839 cards (from 26,427)
-- **Theme Catalog**: Improved coverage and filtering
+_None_
 
 ### Removed
-- **Unused Scripts**: Removed redundant `regenerate_parquet.py`
+_None_
 
 ### Fixed
-- **Card Browser**: Improved UI consistency and image loading
-- **Infinite Scroll**: No more duplicate cards when loading more
-- **Sorting**: Sort order now persists correctly across pages
+_None_