docs: update progress tracking for Epic 4.8 completion

Mark Epic 4.8 (Masterwork → Master rank trigger) as complete.
Epic 4 (Crafting and Class Progression) is now 100% complete (8/8 tasks).

Refs #39

Author: martincjarvis

docs/plans/rules-engine-design.md

@@ -14,28 +14,29 @@ Build a headless .NET 10 simulation engine that validates game design by running
 
 ### Current Sprint Goal
 
-Complete Epic 4 (Crafting and Class Progression) to enable full crafting mechanics and class unlocking.
+Epic 4 (Crafting and Class Progression) complete! Next: Epic 5 (Economy and Inventory) to enable trading and resource management.
 
 ### Epic Status Overview
 
-| Epic | Title                            | Status         | Progress | GitHub Issue |
-| ---- | -------------------------------- | -------------- | -------- | ------------ |
-| 1    | Project Foundation               | ✅ Complete    | 5/5      | #3           |
-| 2    | Time and Simulation Loop         | ✅ Complete    | 6/6      | #4           |
-| 3    | NPC Decision Making              | ✅ Complete    | 6/6      | #5           |
-| 4    | Crafting and Class Progression   | 🔄 In Progress | 7/8      | #6           |
-| 5    | Economy and Inventory            | ⏳ Planned     | 0/6      | #7           |
-| 6    | Contracts and Commitments        | 🔄 Partial     | 2/6      | #8           |
-| 7    | Settlement and Guild             | ⏳ Planned     | 0/6      | #9           |
-| 8    | Scenario Testing Framework       | ⏳ Planned     | 0/7      | #10          |
-| 9    | Persistence                      | ⏳ Planned     | 0/4      | #11          |
-| 10   | Apprenticeship and Role Stacking | ⏳ Planned     | 0/4      | #12          |
-| 11   | Full Progression Scenario        | ⏳ Planned     | 0/5      | #13          |
-
-**Total Progress**: 26/58 tasks complete (45%)
+| Epic | Title                            | Status      | Progress | GitHub Issue |
+| ---- | -------------------------------- | ----------- | -------- | ------------ |
+| 1    | Project Foundation               | ✅ Complete | 5/5      | #3           |
+| 2    | Time and Simulation Loop         | ✅ Complete | 6/6      | #4           |
+| 3    | NPC Decision Making              | ✅ Complete | 6/6      | #5           |
+| 4    | Crafting and Class Progression   | ✅ Complete | 8/8      | #6           |
+| 5    | Economy and Inventory            | ⏳ Planned  | 0/6      | #7           |
+| 6    | Contracts and Commitments        | 🔄 Partial  | 2/6      | #8           |
+| 7    | Settlement and Guild             | ⏳ Planned  | 0/6      | #9           |
+| 8    | Scenario Testing Framework       | ⏳ Planned  | 0/7      | #10          |
+| 9    | Persistence                      | ⏳ Planned  | 0/4      | #11          |
+| 10   | Apprenticeship and Role Stacking | ⏳ Planned  | 0/4      | #12          |
+| 11   | Full Progression Scenario        | ⏳ Planned  | 0/5      | #13          |
+
+**Total Progress**: 27/58 tasks complete (47%)
 
 ### Recent Completions
 
+- ✅ **2026-01-19**: Epic 4.8 - Masterwork → Master rank trigger (#39, PR #136)
 - ✅ **2026-01-19**: Epic 4.7 - CraftingSystem (#38, PR #135)
 - ✅ **2026-01-19**: Epic 4.6 - CraftingOutcomeRule (#37, PR #134)
 - ✅ **2026-01-19**: Epic 4.5 - Define RecipeDefinition (#36, PR #127, commit 8148f26)
@@ -48,7 +49,8 @@ Complete Epic 4 (Crafting and Class Progression) to enable full crafting mechani
 
 Priority order for remaining work:
 
-1. **Epic 4.8** - #39: Implement Masterwork → Master rank trigger
+1. **Epic 5** - #7: Economy and Inventory (0/6 tasks)
+2. **Epic 6** - #8: Complete Contracts and Commitments (4/6 remaining)
 
 ## Key Design Decisions
 
@@ -250,11 +252,13 @@ _For implementation patterns, examine referenced code paths._
 - ✅ Event emission with outcome details
 - **Verified**: 8 tests pass, crafting produces items and awards XP, all 511 tests pass
 
-**4.8 Implement Masterwork → Master rank trigger** ⏳ _Issue #39_
+**4.8 Implement Masterwork → Master rank trigger** ✅ _Issue #39, PR #136_
 
-- Creating Masterwork immediately grants Master rank
-- Emit event
-- **Verify**: Masterwork creation triggers Master rank
+- ✅ MasterRankAchievedEvent for tracking Master rank achievements
+- ✅ Masterwork outcome immediately grants Master rank (level 10)
+- ✅ Event emission with trigger reason
+- ✅ Handles already-Master characters (no duplicate events)
+- **Verified**: 4 tests pass, Masterwork triggers Master rank, all 515 tests pass
 
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