[AZ-588] Remove empty scaffolding dirs Entities/ + DTOs/Requests/

Refactor 02-baseline-cleanup C01. Both directories were untracked
empty placeholders surviving the May 14 missions rename; deleted from
working tree via rmdir (git was not tracking either). No source-code
diff. Verified post-removal: dotnet build OK (0/0 warn/err);
scripts/run-tests.sh = 48 pass / 0 fail / 30 skip (baseline match).

Batch report: _docs/03_implementation/batch_05_cycle1_report.md
Autodev: Step 10 (Implement) -> Step 11 (Run Tests), cycle 1.

Co-authored-by: Cursor <cursoragent@cursor.com>

_docs/tasks/done/AZ-588_refactor_remove_empty_scaffolding_dirs.md

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+# Refactor 02-baseline-cleanup C01 — Remove empty scaffolding dirs
+
+**Status**: Done (2026-05-16) — batch report: `_docs/03_implementation/batch_05_cycle1_report.md`
+
+**Task**: AZ-588_refactor_remove_empty_scaffolding_dirs
+**Name**: Remove empty scaffolding dirs `Entities/` and `DTOs/Requests/`
+**Description**: Delete the two empty placeholder directories at the repo root that survived the May 14 missions/vehicles rename. Closes the only remaining open item from the architecture-compliance baseline scan (F4 partial).
+**Complexity**: 1 point
+**Dependencies**: None
+**Component**: refactor — `02-baseline-cleanup`
+**Tracker**: [AZ-588](https://denyspopov.atlassian.net/browse/AZ-588)
+**Epic**: [AZ-587](https://denyspopov.atlassian.net/browse/AZ-587)
+
+## Problem
+
+Two empty scaffolding directories at the repo root survive from the pre-rename layout. Neither is owned by any component per `_docs/02_document/module-layout.md`. They suggest alternate persistence/DTO trees that don't exist.
+
+- `Database/Entities/*.cs` is the actual entity location.
+- `DTOs/*.cs` (flat, no `Requests/` sub-grouping) is the actual request DTO location.
+
+Recorded as F4 (Low Maintainability, partial) in `_docs/02_document/architecture_compliance_baseline.md`. The third originally-empty dir (`Infrastructure/`) is now legitimately used.
+
+## Outcome
+
+- `Entities/` no longer present in the repository.
+- `DTOs/Requests/` no longer present in the repository.
+- `dotnet build` still succeeds.
+- `scripts/run-tests.sh` returns the same baseline (48 pass / 0 fail / 30 env-skip).
+
+## Scope
+
+### Included
+- `git rm -r Entities/`
+- `git rm -r DTOs/Requests/`
+- Verify build + test suite.
+
+### Excluded
+- Any reorganization of existing entities or DTOs.
+- Any change to `Infrastructure/` (now in use).
+- Any rename / namespace change.
+
+## Acceptance Criteria
+
+**AC-1: Directories removed**
+Given the repository at HEAD
+When `git ls-tree -r HEAD -- Entities/ DTOs/Requests/` is run
+Then the output is empty.
+
+**AC-2: Build still passes**
+Given the repository after the change
+When `dotnet build` is run from the repo root
+Then it exits 0.
+
+**AC-3: Test suite still green**
+Given the repository after the change
+When `scripts/run-tests.sh` is run
+Then `test-results/report.csv` shows 48 pass / 0 fail / 30 skip (same skips, no new failures).
+
+## Non-Functional Requirements
+
+None — this is a structural cleanup with no behavior change.
+
+## Blackbox Tests
+
+| AC Ref | Initial Data/Conditions | What to Test | Expected Behavior | NFR References |
+|--------|-------------------------|--------------|-------------------|----------------|
+| AC-3 | Repo state after `git rm -r Entities/ DTOs/Requests/` | Full E2E suite via `scripts/run-tests.sh` | Same outcome as the 2026-05-15 14:03 baseline (48/0/30) | none |
+
+## Constraints
+
+- Architecture Vision (`_docs/02_document/architecture.md`) — strengthens, does not violate.
+- No `.cs` content moves; pure directory removal.
+- Reference scan confirmed zero path-based references outside `_docs/` (see `_docs/04_refactoring/02-baseline-cleanup/discovery/logical_flow_analysis.md`).
+
+## Risks & Mitigation
+
+**Risk 1: Hidden reference**
+- *Risk*: A path-based reference exists somewhere not caught by the initial grep (e.g., a CI script, an editor config, an IDE workspace file).
+- *Mitigation*: Pre-execution `rg -F 'Entities/' -F 'DTOs/Requests/'` repo-wide. Post-execution `dotnet build` + `scripts/run-tests.sh` are the regression nets.