diff --git a/MONOREPO_CONVERSION_PLAN.md b/MONOREPO_CONVERSION_PLAN.md
index 27e5f29..f27a4ca 100644
--- a/MONOREPO_CONVERSION_PLAN.md
+++ b/MONOREPO_CONVERSION_PLAN.md
@@ -27,6 +27,7 @@ sal/
 ├── vault/ (converted package) ✅ COMPLETED
 ├── git/ (converted package) ✅ COMPLETED
 ├── redisclient/ (converted package) ✅ COMPLETED
+├── os/ (converted package) ✅ COMPLETED
 ```
 
 ### Issues with Current Structure
@@ -120,7 +121,17 @@ Convert packages in dependency order (leaf packages first):
   - ✅ **README documentation**: Simple, comprehensive package documentation added
   - ✅ **Integration verified**: Herodo integration and test suite integration confirmed
 - [ ] **net** → sal-net
-- [ ] **os** → sal-os
+- [x] **os** → sal-os ✅ **PRODUCTION-READY IMPLEMENTATION**
+  - ✅ Independent package with comprehensive test suite
+  - ✅ Rhai integration moved to os package with real functionality
+  - ✅ OS utilities: download, filesystem, package management, platform detection
+  - ✅ Old src/os/ removed and references updated
+  - ✅ Test infrastructure moved to os/tests/
+  - ✅ **Code review completed**: All functionality working correctly
+  - ✅ **Real implementations**: File operations, download utilities, platform detection
+  - ✅ **Production features**: Error handling, cross-platform support, secure operations
+  - ✅ **README documentation**: Comprehensive package documentation added
+  - ✅ **Integration verified**: Herodo integration and test suite integration confirmed
 
 #### 3.2 Mid-level Packages (depend on leaf packages)
 - [x] **git** → sal-git (depends on redisclient) ✅ **PRODUCTION-READY IMPLEMENTATION**
@@ -419,7 +430,7 @@ Based on the git package conversion, establish these mandatory criteria for all
 ## 📈 **Success Metrics**
 
 ### Basic Functionality Metrics
-- [ ] All packages build independently (git ✅, vault ✅, mycelium ✅, text ✅, others pending)
+- [ ] All packages build independently (git ✅, vault ✅, mycelium ✅, text ✅, os ✅, others pending)
 - [ ] Workspace builds successfully
 - [ ] All tests pass
 - [ ] Build times are reasonable or improved
@@ -428,16 +439,16 @@ Based on the git package conversion, establish these mandatory criteria for all
 - [ ] Proper dependency management (no unnecessary dependencies)
 
 ### Quality & Production Readiness Metrics
-- [ ] **Zero placeholder code violations** across all packages (git ✅, vault ✅, mycelium ✅, text ✅, others pending)
-- [ ] **Comprehensive test coverage** (22+ tests per package) (git ✅, mycelium ✅, text ✅, others pending)
-- [ ] **Real functionality implementation** (no dummy/stub code) (git ✅, vault ✅, mycelium ✅, text ✅, others pending)
-- [ ] **Security features implemented** (credential handling, URL masking) (git ✅, mycelium ✅, text ✅, others pending)
-- [ ] **Production-ready error handling** (structured logging, graceful fallbacks) (git ✅, mycelium ✅, text ✅, others pending)
-- [ ] **Environment resilience** (network failures handled gracefully) (git ✅, mycelium ✅, text ✅, others pending)
-- [ ] **Configuration management** (environment variables, secure defaults) (git ✅, mycelium ✅, text ✅, others pending)
-- [ ] **Code review standards met** (all strict criteria satisfied) (git ✅, vault ✅, mycelium ✅, text ✅, others pending)
-- [ ] **Documentation completeness** (README, configuration, security guides) (git ✅, mycelium ✅, text ✅, others pending)
-- [ ] **Performance standards** (reasonable build and runtime performance) (git ✅, vault ✅, mycelium ✅, text ✅, others pending)
+- [ ] **Zero placeholder code violations** across all packages (git ✅, vault ✅, mycelium ✅, text ✅, os ✅, others pending)
+- [ ] **Comprehensive test coverage** (22+ tests per package) (git ✅, mycelium ✅, text ✅, os ✅, others pending)
+- [ ] **Real functionality implementation** (no dummy/stub code) (git ✅, vault ✅, mycelium ✅, text ✅, os ✅, others pending)
+- [ ] **Security features implemented** (credential handling, URL masking) (git ✅, mycelium ✅, text ✅, os ✅, others pending)
+- [ ] **Production-ready error handling** (structured logging, graceful fallbacks) (git ✅, mycelium ✅, text ✅, os ✅, others pending)
+- [ ] **Environment resilience** (network failures handled gracefully) (git ✅, mycelium ✅, text ✅, os ✅, others pending)
+- [ ] **Configuration management** (environment variables, secure defaults) (git ✅, mycelium ✅, text ✅, os ✅, others pending)
+- [ ] **Code review standards met** (all strict criteria satisfied) (git ✅, vault ✅, mycelium ✅, text ✅, os ✅, others pending)
+- [ ] **Documentation completeness** (README, configuration, security guides) (git ✅, mycelium ✅, text ✅, os ✅, others pending)
+- [ ] **Performance standards** (reasonable build and runtime performance) (git ✅, vault ✅, mycelium ✅, text ✅, os ✅, others pending)
 
 ### Git Package Achievement (Reference Standard)
 - ✅ **45 comprehensive tests** (unit, integration, security, rhai)