docs: add Phase 5 implementation plan for environment state management

Create comprehensive implementation plan for integrating type-safe state
management into commands with 4 subtasks:

**Subtask 1: Preparatory Refactoring**
- Extract logical phases from command execute() methods
- Remove redundant dependencies
- Add error context extraction helpers
- Setup repository infrastructure in Container
- Add 7 tests (2 unit + 5 integration for repository/locking)

**Subtask 2: Document Architectural Decision (ADR)**
- Create ADR for command state return pattern
- Document rationale for typed returns vs pure command handler
- Explain alternatives considered and consequences

**Subtask 3: Update ProvisionCommand**
- Accept Environment<Created>, return Environment<Provisioned>
- Integrate state transitions (Provisioning, Provisioned, ProvisionFailed)
- Add persistence integration with graceful error handling
- Update Container factory and E2E binaries (breaking change)
- Add 7 unit tests for state management

**Subtask 4: Update ConfigureCommand**
- Accept Environment<Provisioned>, return Environment<Configured>
- Integrate state transitions (Configuring, Configured, ConfigureFailed)
- Add persistence integration with graceful error handling
- Update Container factory and E2E binaries (breaking change)
- Add 7 unit tests for state management

**Key Features:**
- Compile-time prevention of invalid state transitions
- Automatic state persistence after each transition
- Error states with failed step context for recovery guidance
- Graceful handling of persistence failures
- Per-environment file locking (30-second timeout)
- Complete integration with Container DI and E2E tests

**Test Impact:** 663 → 684 tests (+21 total)
**Dependencies:** Phases 1-4 complete (type-state pattern, logging,
serialization, persistence layer with file locking)

Includes comprehensive integration considerations covering state file
management, concurrent execution, error recovery, repository configuration,
logging/observability, and compile-time type safety demonstrations.

Author: josecelano

docs/features/environment-state-management/implementation-plan/README.md

@@ -125,17 +125,17 @@
 
 ### 📅 Phase 5: Command Integration (PLANNED)
 
-**Goal**: Update commands to use type-safe state transitions and orchestration.
+**Goal**: Update commands to use type-safe state transitions and state persistence.
 
 **Status**: 📅 Planned for future implementation
 
 **Key Deliverables**:
 
 - Commands accept and return specific state types
 - Type-safe state transitions in command execution
-- Orchestration layer for chaining commands
 - Error state handling with compile-time guarantees
 - State persistence during command execution
+- Graceful handling of persistence failures
 
 ---
 
@@ -319,3 +319,47 @@ The entire feature is considered complete when:
 - ✅ Manual recovery documentation is complete (Phase 6 - CRITICAL)
 - ✅ Documentation is comprehensive
 - ✅ User feedback is incorporated
+
+---
+
+## 🔮 Future Enhancements (Beyond Phase 6)
+
+After completing the core Environment State Management feature, consider these enhancements:
+
+### Command Orchestration Layer
+
+Build a high-level `DeploymentOrchestrator` that chains commands with compile-time state validation:
+
+```rust
+// Example fluent API
+let configured = orchestrator
+    .provision(environment).await?
+    .configure()?;
+
+// Or full workflow method
+let configured = orchestrator
+    .provision_and_configure(environment).await?;
+```
+
+**Benefits**:
+
+- Type-safe command chaining with compile-time guarantees
+- Simplified API for common workflows
+- Centralized error handling across commands
+- Better separation of concerns (commands focus on their task, orchestrator handles workflow)
+
+**Trade-offs**:
+
+- Additional layer of abstraction
+- More complex dependency injection
+- May obscure individual command execution for debugging
+
+**Decision**: Deferred to future work. Phase 5 focuses on getting commands to persist state correctly. Orchestration can be added later when the need for complex workflows becomes clear.
+
+### Additional Future Work
+
+- **CLI Development**: Create user-facing CLI that leverages the orchestrator
+- **Advanced Recovery**: Implement automatic detection and recovery from interrupted operations
+- **State Validation**: Add infrastructure state validation against stored state
+- **Event Sourcing**: Track full transition history for audit and replay
+- **Multi-Environment Dashboard**: Visual tool to monitor multiple environment states