docs: mark point 5 of provisioned container refactoring as completed

- ✅ Point 5: Robust SSH Connectivity Testing marked as completed
- Updated status from proposed solution to implementation completed
- Added checkmarks to all benefits achieved
- SSH readiness check now uses actual connectivity testing instead of simple sleep

Author: josecelano

docs/refactors/provisioned-container-refactoring.md

@@ -315,11 +315,11 @@ pub enum SshWaitError {
 - ✅ Proper error chain preservation using `#[source]` attributes
 - ✅ Comprehensive test coverage for all enhanced error types
 
-### 5. Robust SSH Connectivity Testing
+### ✅ 5. Robust SSH Connectivity Testing (Completed)
 
-**Current Issue**: SSH readiness check is a simple sleep without actual connectivity testing.
+**Issue Resolved**: SSH readiness check is now implemented with actual connectivity testing instead of simple sleep.
 
-**Proposed Solution**:
+**Implementation Completed**:
 
 ```rust
 impl ContainerSshManager for DockerContainerSshManager {
@@ -348,12 +348,12 @@ impl ContainerSshManager for DockerContainerSshManager {
 }
 ```
 
-**Benefits**:
+**Benefits Achieved**:
 
-- Actual SSH connectivity verification
-- Exponential backoff for efficiency
-- Configurable timeouts
-- Better failure detection
+- ✅ Actual SSH connectivity verification
+- ✅ Exponential backoff for efficiency
+- ✅ Configurable timeouts
+- ✅ Better failure detection
 
 ### 6. Add Timeout Configurations