Update ROADMAP.md to reflect completion of Issue #69 (Sequence Protocol)

- Mark Issue #69 as complete in all sections
- Add achievement entry for Python Sequence Protocol implementation
- Update alpha blockers count: 3 remaining (was 4)
- Update total open issues: 62 (was 63)
- Next priorities: Z-order rendering (#63) or RenderTexture (#6)

🤖 Generated with [Claude Code](https://claude.ai/code)

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

ROADMAP.md

@@ -3,14 +3,23 @@
 ## Project Status: Post-7DRL 2025 "Crypt of Sokoban"
 
 **Current State**: Successful 7DRL completion with Python/C++ game engine  
-**Latest Update**: Animation system complete! Issue #59 resolved (2025-07-05)  
+**Latest Update**: Python Sequence Protocol complete! Issue #69 resolved (2025-07-05)  
-**Branch**: interpreter_mode (animation system + property interpolation for all UI classes)  
+**Branch**: interpreter_mode (full sequence protocol for collections + default values)  
-**Open Issues**: ~47 remaining from original 64 (closed 15 + fixed 14 previously)
+**Open Issues**: ~46 remaining from original 64 (closed 16 + fixed 14 previously)
 
 ---
 
 ## Recent Achievements
 
+### 2025-07-05: Python Sequence Protocol Complete! 🎉
+**Issue #69 Resolved**: Full sequence protocol implementation for collections
+- Complete __setitem__, __delitem__, __contains__ support
+- Slice operations with extended slice support (step != 1)
+- Concatenation (+) and in-place concatenation (+=) with validation
+- Negative indexing throughout, index() and count() methods
+- Type safety: UICollection (Frame/Caption/Sprite/Grid), EntityCollection (Entity only)
+- Default value support: None for texture/font parameters uses engine defaults
+
 ### 2025-07-05: Animation System Complete! 🎉
 **Issue #59 Resolved**: Comprehensive animation system with 30+ easing functions
 - Property-based animations for all UI classes (Frame, Caption, Sprite, Grid, Entity)
@@ -83,14 +92,13 @@ Created comprehensive test suite with 13 tests covering all Python-exposed metho
 - #41: UICollection.find(name) method
 - #38: Frame 'children' constructor parameter
 - #33: Sprite index validation
-- #69: Partial Sequence Protocol (no slicing, 'in' operator)
 
 ---
 
 ## 🚧 NEXT PRIORITY: Alpha Release Blockers
 
-### Remaining Alpha Blockers (4 issues):
+### Remaining Alpha Blockers (3 issues):
-1. **#69** - Python Sequence Protocol for collections - *Extensive Overhaul*
+1. ~~**#69** - Python Sequence Protocol for collections~~ - *Completed! (2025-07-05)*
 2. **#63** - Z-order rendering for UIDrawables - *Multiple Integrations*
 3. ~~**#59** - Animation system~~ - *Completed! (2025-07-05)*
 4. **#6** - RenderTexture concept - *Extensive Overhaul*
@@ -108,16 +116,16 @@ Created comprehensive test suite with 13 tests covering all Python-exposed metho
 
 - [ ] **Grid Point Iterator Implementation** - Complete the remaining grid iteration work
 - [x] **#73** - Add `entity.index()` method for collection removal - *Fixed*
-- [ ] **#69** ⚠️ **Alpha Blocker** - Refactor all collections to use Python Sequence Protocol - *Extensive Overhaul*
+- [x] **#69** ⚠️ **Alpha Blocker** - Refactor all collections to use Python Sequence Protocol - *Completed! (2025-07-05)*
 
 **Dependencies**: Grid point iterators → #73 entity.index() → #69 Sequence Protocol overhaul
 
 ---
 
-## 🎯 ALPHA 0.1 RELEASE BLOCKERS (4 Remaining)
+## 🎯 ALPHA 0.1 RELEASE BLOCKERS (3 Remaining)
 
 ### ⚠️ Must Complete Before Alpha Release
-- [ ] **#69** - Collections use Python Sequence Protocol - *Extensive Overhaul*
+- [x] **#69** - Collections use Python Sequence Protocol - *Completed! (2025-07-05)*
 - [ ] **#63** - Z-order rendering for UIDrawables - *Multiple Integrations*  
 - [x] **#59** - Animation system for arbitrary UIDrawable fields - *Completed! (2025-07-05)*
 - [ ] **#6** - RenderTexture concept for all UIDrawables - *Extensive Overhaul*
@@ -132,8 +140,8 @@ Created comprehensive test suite with 13 tests covering all Python-exposed metho
 ### 🎮 Core Engine Systems
 
 #### Iterator/Collection System (2 issues)
-- [ ] **#73** - Entity index() method for removal - *Isolated Fix*
+- [x] **#73** - Entity index() method for removal - *Fixed*
-- [ ] **#69** ⚠️ **Alpha Blocker** - Sequence Protocol refactor - *Extensive Overhaul*
+- [x] **#69** ⚠️ **Alpha Blocker** - Sequence Protocol refactor - *Completed! (2025-07-05)*
 
 #### Python/C++ Integration (7 issues)  
 - [ ] **#76** - UIEntity derived type preservation in collections - *Multiple Integrations*
@@ -300,7 +308,7 @@ REMAINING IN PHASE 1:
 4. **Multi-Platform**: Windows/Linux feature parity maintained
 
 ### Success Metrics for Alpha 0.1
-- [ ] All 7 Alpha Blocker issues resolved
+- [ ] All Alpha Blocker issues resolved (5 of 7 complete: #69, #59, #47, #3, #2)
 - [ ] Grid point iteration complete and tested
 - [ ] Clean build on Windows and Linux  
 - [ ] Documentation sufficient for external developers
@@ -329,8 +337,8 @@ REMAINING IN PHASE 1:
 ---
 
 *Last Updated: 2025-07-05*  
-*Total Open Issues: 63* (from original 78)  
+*Total Open Issues: 62* (from original 78)  
-*Alpha Blockers: 4* (was 7 - completed #59 Animation, #47 README, #3/#2 deprecated methods)  
+*Alpha Blockers: 3* (was 7 - completed #69 Sequence Protocol, #59 Animation, #47 README, #3/#2 deprecated methods)  
-*Current Work: Animation system complete! Property interpolation for all UI classes*  
+*Current Work: Python Sequence Protocol complete! Full collection behavior with slicing, operators, and type safety*  
-*Next Session: Z-order rendering (#63) or Python Sequence Protocol (#69)*
+*Next Session: Z-order rendering (#63) or RenderTexture concept (#6)*