[AZ-372] Add .editorconfig, Directory.Build.props, format/coverage wiring

Wires the C19 tooling baseline so dotnet format and Coverlet gate the
test script and a small NetAnalyzers ruleset (CA1001, CA1051, CA1816,
CA2227) at warning severity is visible from the next build.

- .editorconfig (new, root=true): whitespace rules, per-extension
  indent sizes, C# style preferences as suggestions, initial CA rules.
- Directory.Build.props (new): EnableNETAnalyzers=true,
  AnalysisLevel=latest, AnalysisMode=None so only rules explicitly
  enabled in .editorconfig fire; EnforceCodeStyleInBuild=false to keep
  build clean from style.
- scripts/run-tests.sh: Step 0 runs dotnet format whitespace
  --verify-no-changes via Docker SDK; unit/integration test calls now
  collect XPlat Code Coverage into TestResults/. New --skip-format
  escape hatch.
- .gitignore: TestResults/, coverage.cobertura.xml, *.coverage.
- SatelliteProvider.Tests/ToolingConfigurationTests.cs (new, 6 tests):
  runtime assertions that the config files, script wiring, and
  coverlet.collector reference are all in place; mirrors the
  AcceptanceCriteriaRT2Tests pattern.

Whitespace cleanup that the new format gate uncovers is staged for the
next commit (per AZ-372 spec: "commit cleanup as a separate batch").

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

scripts/run-tests.sh

@@ -11,40 +11,62 @@ trap cleanup EXIT
 
 usage() {
     cat <<EOF
-Usage: $(basename "$0") [--unit-only | --smoke | --full]
+Usage: $(basename "$0") [--unit-only | --smoke | --full] [--skip-format]
 
 Modes:
   --unit-only   Run only the .NET unit test project (no Docker Compose, no integration tests)
   --smoke       Run unit tests + a fast integration subset (~2 min target, tightened timeouts)
   --full        Run unit tests + the full integration suite (default if no flag is provided)
 
+Flags:
+  --skip-format Skip the dotnet format --verify-no-changes check (use only for emergency runs)
+
 Environment:
   GOOGLE_MAPS_API_KEY  Required for any integration test mode (loaded from .env or shell env).
 EOF
 }
 
 mode="full"
-case "${1:-}" in
-    --unit-only) mode="unit"; ;;
-    --smoke)     mode="smoke"; ;;
-    --full)      mode="full"; ;;
-    -h|--help)   usage; exit 0; ;;
-    "")          ;;
-    *)           echo "Unknown argument: $1"; usage; exit 2; ;;
-esac
+skip_format="false"
+for arg in "$@"; do
+    case "$arg" in
+        --unit-only)   mode="unit"; ;;
+        --smoke)       mode="smoke"; ;;
+        --full)        mode="full"; ;;
+        --skip-format) skip_format="true"; ;;
+        -h|--help)     usage; exit 0; ;;
+        "")            ;;
+        *)             echo "Unknown argument: $arg"; usage; exit 2; ;;
+    esac
+done
 
 echo "=== Satellite Provider Test Suite ==="
 echo "Mode: $mode"
 echo ""
 
+if [[ "$skip_format" == "true" ]]; then
+    echo "Step 0: Skipping dotnet format check (--skip-format)"
+else
+    echo "Step 0: dotnet format whitespace --verify-no-changes"
+    if ! docker run --rm -v "$PROJECT_ROOT:/src" -w /src mcr.microsoft.com/dotnet/sdk:8.0 \
+        dotnet format whitespace SatelliteProvider.sln --verify-no-changes; then
+        echo ""
+        echo "ERROR: Whitespace violations detected. Run 'dotnet format whitespace SatelliteProvider.sln' to fix."
+        exit 4
+    fi
+    echo ""
+fi
+
 if [[ "$mode" == "unit" ]]; then
     echo "Running unit tests only..."
     docker run --rm -v "$PROJECT_ROOT:/src" -w /src mcr.microsoft.com/dotnet/sdk:8.0 \
         dotnet test SatelliteProvider.Tests/SatelliteProvider.Tests.csproj \
         --no-restore --configuration Release \
+        --collect:"XPlat Code Coverage" \
+        --results-directory /src/TestResults \
         --logger "console;verbosity=normal"
     echo ""
-    echo "=== Unit tests complete ==="
+    echo "=== Unit tests complete (coverage written to ./TestResults/) ==="
     exit 0
 fi
 
@@ -62,7 +84,7 @@ fi
 
 echo "Step 1: Unit tests"
 docker run --rm -v "$PROJECT_ROOT:/src" -w /src mcr.microsoft.com/dotnet/sdk:8.0 \
-    sh -c "dotnet restore SatelliteProvider.sln && dotnet test SatelliteProvider.Tests/SatelliteProvider.Tests.csproj --no-restore --configuration Release --logger 'console;verbosity=normal'"
+    sh -c "dotnet restore SatelliteProvider.sln && dotnet test SatelliteProvider.Tests/SatelliteProvider.Tests.csproj --no-restore --configuration Release --collect:'XPlat Code Coverage' --results-directory /src/TestResults --logger 'console;verbosity=normal'"
 
 echo ""
 echo "Step 2: Integration tests (Docker Compose, mode=$mode)"