chore: mark completed refactoring plans as done

Move completed refactorings to completed-refactorings.md:
- Docker Compose Topology Domain Model (Epic #287, 8 proposals)
- Strengthen Domain Invariant Enforcement (Issue #281, 6 proposals)

Delete plan documents from plans/ (work preserved in git history).

Author: josecelano

docs/refactors/active-refactorings.md

@@ -1,7 +1,5 @@
 # Active Refactoring Plans
 
-| Document                                                                                              | Status         | Issue                                                                  | Target                                                 | Created    |
-| ----------------------------------------------------------------------------------------------------- | -------------- | ---------------------------------------------------------------------- | ------------------------------------------------------ | ---------- |
-| [Simplify Controller Command Handler Creation](plans/simplify-controller-command-handler-creation.md) | 📋 Planning    | TBD                                                                    | Remove unnecessary progress steps                      | 2025-12-17 |
-| [Strengthen Domain Invariant Enforcement](plans/strengthen-domain-invariant-enforcement.md)           | 🚧 In Progress | [#281](https://github.com/torrust/torrust-tracker-deployer/issues/281) | Enforce DDD invariants in domain layer                 | 2026-01-21 |
-| [Docker Compose Topology Domain Model](plans/docker-compose-topology-domain-model.md)                 | 📋 Planning    | TBD                                                                    | Move topology rules to domain, derive volumes/networks | 2026-01-22 |
+| Document                                                                                              | Status      | Issue | Target                            | Created    |
+| ----------------------------------------------------------------------------------------------------- | ----------- | ----- | --------------------------------- | ---------- |
+| [Simplify Controller Command Handler Creation](plans/simplify-controller-command-handler-creation.md) | 📋 Planning | TBD   | Remove unnecessary progress steps | 2025-12-17 |

docs/refactors/completed-refactorings.md

@@ -2,6 +2,8 @@
 
 | Document                                    | Completed    | Target                                                                 | Notes                                                                                                                                                                                                                                            |
 | ------------------------------------------- | ------------ | ---------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
+| Docker Compose Topology Domain Model        | Jan 26, 2026 | Move topology rules to domain, derive volumes/networks                 | See git history at `docs/refactors/plans/docker-compose-topology-domain-model.md` - Moved all Docker Compose topology decisions to domain layer with Network/Service enums and DockerComposeTopology aggregate (Epic #287, 8 proposals)          |
+| Strengthen Domain Invariant Enforcement     | Jan 26, 2026 | Enforce DDD invariants in domain layer                                 | See git history at `docs/refactors/plans/strengthen-domain-invariant-enforcement.md` - Added validated constructors and private fields to domain config types (Issue #281, 6 proposals, all completed)                                           |
 | Secret Type Introduction                    | Dec 18, 2025 | Secret handling for sensitive data (API tokens, passwords)             | See git history at `docs/refactors/plans/secret-type-introduction.md` - Introduced `ApiToken` and `Password` wrappers using secrecy crate for sensitive data handling (Issue #243)                                                               |
 | Rename Test Functions to Follow Conventions | Dec 12, 2025 | All test functions with `test_` prefix (21 files)                      | See git history at `docs/refactors/plans/rename-test-functions-to-follow-conventions.md` - Renamed 93 test functions and 14 helper functions across 20 files to follow behavior-driven naming conventions (21 proposals, all completed), PR #228 |
 | Command Code Quality Improvements           | Dec 3, 2025  | `ProvisionCommand`, `ConfigureCommand`                                 | See git history at `docs/refactors/plans/command-code-quality-improvements.md` - API simplification, state persistence, clock injection, trace writing, and test builders (5 of 9 proposals completed, 4 postponed for future work)              |