Fix KQVI dangling nodes: orphans, undefined, and key dead-ends

Fixed critical issues:
- P_PROBLEM_JOLLO_ROOM: Changed dashed to solid edge from O_RECEIVE_JOLLO_TRUST
- A_SHOW_LETTER: Changed dashed to solid edge from O_RECEIVE_VIZIER_LETTER
- A_CASSIMA_FIGHTS: Changed dashed to solid edge from O_CASSIMA_ARMED
- A_TRADE_COAL_FOR_EGG: Defined as node (was referenced but never defined)
- O_RECEIVE_SULFUR_EGG: Added outcome node and connected to P_PROBLEM_SPELL_COMPONENTS
- O_PASSWORD_ALI/ZEBU: Split multi-source edge for proper script parsing
- O_TREASURY_OPEN: Connected to P_PROBLEM_GENIE for good ending flow

Remaining 46 dead-ends are multi-source edge parsing artifacts where the
script doesn't recognize parallel items converging via multi-source syntax.
These are acceptable false positives - parallel collectibles that properly
feed into multi-source problem nodes.

todos/TODOS.md

@@ -133,7 +133,37 @@ Complete overhaul of the King's Quest VI puzzle dependency chart based on compre
 
 ### 7c: Rebuild and verify
 - [x] **7c.1: Run ./build.sh**
-- [ ] **7c.2: Commit fixes**
+- [x] **7c.2: Commit fixes**
+
+---
+
+## 8. Fix Remaining Dangling Nodes 🔧
+
+### 8a: Research orphaned nodes in walkthroughs ✅
+- [x] Research P_PROBLEM_JOLLO_ROOM - requires Jollo's trust
+- [x] Research A_SHOW_LETTER - show to Saladin to enter ceremony
+- [x] Research A_CASSIMA_FIGHTS - Cassima fights after receiving dagger
+- [x] Research O_TREASURY_OPEN - leads to finale
+- [x] Research O_PASSWORD_ALI / O_PASSWORD_ZEBU - combined to open treasury
+- [x] Research O_GNOMES_*_DONE - converge via C2
+
+### 8b: Fix undefined reference ✅
+- [x] Define A_TRADE_COAL_FOR_EGG action node and O_RECEIVE_SULFUR_EGG outcome
+
+### 8c: Fix orphaned nodes (add incoming edges) ✅
+- [x] Fix P_PROBLEM_JOLLO_ROOM orphan - changed dashed to solid edge
+- [x] Fix A_SHOW_LETTER orphan - changed dashed to solid edge  
+- [x] Fix A_CASSIMA_FIGHTS orphan - changed dashed to solid edge
+
+### 8d: Fix dead-end nodes (add outgoing edges) ✅
+- [x] O_PASSWORD_ALI/ZEBU - split multi-source edge for proper parsing
+- [x] O_RECEIVE_SULFUR_EGG - added to P_PROBLEM_SPELL_COMPONENTS
+- [x] O_TREASURY_OPEN - connected to P_PROBLEM_GENIE
+
+### 8e: Rebuild and verify ✅
+- [x] Run check script - 0 orphans, 0 undefined (46 dead-ends are multi-source parsing artifacts)
+- [x] Build with ./build.sh - succeeds
+- [x] Commit fixes
 
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