feat: field-move Drop (partial/nested/ptr), stmt/pat macros, Windows runtime

Sessions 70–74: partialMovedPaths + ptrAliases in bootstrap/selfhost CBE,
remaining drops after field moves, macro stmt/pat fragments, runtime_win.c
and MinGW hello CI, examples + drop-move smoke coverage, QUALITY_PLAN update.

tools/smoke_drop_move.sh

@@ -58,7 +58,97 @@ if sed -n '/^Array_int TakeItems/,/^}/p' "$TMP/mp/build/main.c" | grep -q 'Bag_D
   sed -n '/^Array_int TakeItems/,/^}/p' "$TMP/mp/build/main.c"
   exit 1
 fi
-echo "  move_field_partial: PASS (run + TakeItems has no Bag_Drop)"
+# PeekTagAndTake must Drop the moved-out Array after Array_Len mono (defer restore)
+if ! sed -n '/^int PeekTagAndTake/,/^}/p' "$TMP/mp/build/main.c" | grep -q 'Array_Drop'; then
+  echo "error: PeekTagAndTake missing Array_Drop for moved local (defer restore?)" >&2
+  sed -n '/^int PeekTagAndTake/,/^}/p' "$TMP/mp/build/main.c"
+  exit 1
+fi
+echo "  move_field_partial: PASS (run + TakeItems has no Bag_Drop + PeekTag drops moved)"
+
+# --- remaining field Drop after partial move ---
+echo "=== smoke: move_field_remaining ==="
+mkdir -p "$TMP/mr/src"
+cp -a "$ROOT/rt" "$TMP/mr/"
+cat > "$TMP/mr/bux.toml" <<'EOF'
+[Package]
+Name    = "move_field_remaining"
+Version = "0.1.0"
+Type    = "bin"
+
+[Build]
+Output = "Bin"
+EOF
+cp "$ROOT/examples/move_field_remaining.bux" "$TMP/mr/src/Main.bux"
+(cd "$TMP/mr" && "$BUXC" run .)
+# TakeLeft must not PairBag_Drop, but must Tracked_Drop remaining right field
+if sed -n '/^Array_int TakeLeft/,/^}/p' "$TMP/mr/build/main.c" | grep -q 'PairBag_Drop'; then
+  echo "error: TakeLeft still PairBag_Drops after partial field move" >&2
+  sed -n '/^Array_int TakeLeft/,/^}/p' "$TMP/mr/build/main.c"
+  exit 1
+fi
+if ! sed -n '/^Array_int TakeLeft/,/^}/p' "$TMP/mr/build/main.c" | grep -q 'Tracked_Drop'; then
+  echo "error: TakeLeft missing Tracked_Drop for remaining field" >&2
+  sed -n '/^Array_int TakeLeft/,/^}/p' "$TMP/mr/build/main.c"
+  exit 1
+fi
+echo "  move_field_remaining: PASS (run + no PairBag_Drop + Tracked_Drop on right)"
+
+# --- nested path move outer.inner.items ---
+echo "=== smoke: move_field_nested ==="
+mkdir -p "$TMP/mn/src"
+cp -a "$ROOT/rt" "$TMP/mn/"
+cat > "$TMP/mn/bux.toml" <<'EOF'
+[Package]
+Name    = "move_field_nested"
+Version = "0.1.0"
+Type    = "bin"
+
+[Build]
+Output = "Bin"
+EOF
+cp "$ROOT/examples/move_field_nested.bux" "$TMP/mn/src/Main.bux"
+(cd "$TMP/mn" && "$BUXC" run .)
+# TakeNestedItems: no Outer_Drop; must Tracked_Drop remaining note + tag
+if sed -n '/^Array_int TakeNestedItems/,/^}/p' "$TMP/mn/build/main.c" | grep -q 'Outer_Drop'; then
+  echo "error: TakeNestedItems still Outer_Drops after nested path move" >&2
+  sed -n '/^Array_int TakeNestedItems/,/^}/p' "$TMP/mn/build/main.c"
+  exit 1
+fi
+tdrops=$(sed -n '/^Array_int TakeNestedItems/,/^}/p' "$TMP/mn/build/main.c" | grep -c 'Tracked_Drop' || true)
+if [[ "${tdrops:-0}" -lt 2 ]]; then
+  echo "error: TakeNestedItems expected ≥2 Tracked_Drop (inner.note + tag), got $tdrops" >&2
+  sed -n '/^Array_int TakeNestedItems/,/^}/p' "$TMP/mn/build/main.c"
+  exit 1
+fi
+echo "  move_field_nested: PASS (run + no Outer_Drop + Tracked_Drop remaining)"
+
+# --- pointer field move p.items / (*p).items ---
+echo "=== smoke: move_field_ptr ==="
+mkdir -p "$TMP/mptr/src"
+cp -a "$ROOT/rt" "$TMP/mptr/"
+cat > "$TMP/mptr/bux.toml" <<'EOF'
+[Package]
+Name    = "move_field_ptr"
+Version = "0.1.0"
+Type    = "bin"
+
+[Build]
+Output = "Bin"
+EOF
+cp "$ROOT/examples/move_field_ptr.bux" "$TMP/mptr/src/Main.bux"
+(cd "$TMP/mptr" && "$BUXC" run .)
+if sed -n '/^Array_int TakeViaPtr/,/^}/p' "$TMP/mptr/build/main.c" | grep -q 'Bag_Drop'; then
+  echo "error: TakeViaPtr still Bag_Drops after p.items move" >&2
+  sed -n '/^Array_int TakeViaPtr/,/^}/p' "$TMP/mptr/build/main.c"
+  exit 1
+fi
+if ! sed -n '/^Array_int TakeViaPtr/,/^}/p' "$TMP/mptr/build/main.c" | grep -q 'Tracked_Drop'; then
+  echo "error: TakeViaPtr missing Tracked_Drop for remaining tag" >&2
+  sed -n '/^Array_int TakeViaPtr/,/^}/p' "$TMP/mptr/build/main.c"
+  exit 1
+fi
+echo "  move_field_ptr: PASS (run + no Bag_Drop + Tracked_Drop remaining)"
 
 # --- early return Drop counts ---
 echo "=== smoke: drop_early_return ==="
@@ -78,4 +168,4 @@ out=$(cd "$TMP/de" && "$BUXC" run .)
 echo "$out" | grep -q 'PASS'
 echo "  drop_early_return: PASS"
 
-echo "PASS: smoke_drop_move (field-move + partial + early-return)"
+echo "PASS: smoke_drop_move (field-move + partial + remaining + nested + ptr + early-return)"

tools/smoke_windows_hello.sh

@@ -0,0 +1,68 @@
+#!/usr/bin/env bash
+# Session 71 — Windows / MinGW hello smoke (also testable on Unix via BUX_RUNTIME=win).
+# Builds examples/hello.bux with the minimal runtime and checks stdout.
+set -euo pipefail
+ROOT="$(cd "$(dirname "$0")/.." && pwd)"
+export BUX_STDLIB="${BUX_STDLIB:-$ROOT/lib}"
+unset BUX_DEBUG_FILE || true
+
+# Prefer buxc.exe on Windows, else buxc
+if [[ -x "$ROOT/buxc.exe" ]]; then
+  BUXC="$ROOT/buxc.exe"
+elif [[ -x "$ROOT/buxc" ]]; then
+  BUXC="$ROOT/buxc"
+else
+  (cd "$ROOT" && make build)
+  if [[ -x "$ROOT/buxc.exe" ]]; then BUXC="$ROOT/buxc.exe"
+  else BUXC="$ROOT/buxc"
+  fi
+fi
+
+# Force minimal runtime when not already on Windows (Linux/macOS local check)
+case "$(uname -s 2>/dev/null || echo unknown)" in
+  MINGW*|MSYS*|CYGWIN*|Windows_NT) ;;
+  *)
+    export BUX_RUNTIME="${BUX_RUNTIME:-win}"
+    ;;
+esac
+
+if ! command -v gcc >/dev/null 2>&1 && ! command -v cc >/dev/null 2>&1; then
+  echo "error: need gcc/cc on PATH (MinGW on Windows)" >&2
+  exit 1
+fi
+
+TMP=$(mktemp -d)
+trap 'rm -rf "$TMP"' EXIT
+mkdir -p "$TMP/src"
+cp -a "$ROOT/rt" "$TMP/"
+cat > "$TMP/bux.toml" <<'EOF'
+[Package]
+Name    = "hello"
+Version = "0.1.0"
+Type    = "bin"
+
+[Build]
+Output = "Bin"
+EOF
+cp "$ROOT/examples/hello.bux" "$TMP/src/Main.bux"
+
+echo "=== smoke_windows_hello: build+run ==="
+out=$("$BUXC" run "$TMP" 2>&1) || {
+  echo "$out" >&2
+  exit 1
+}
+echo "$out"
+echo "$out" | grep -q 'Hello, Bux!'
+
+# Confirm minimal runtime was used when forced / on Windows
+if [[ -f "$TMP/build/runtime.c" ]]; then
+  if ! grep -q 'Windows / MinGW minimal' "$TMP/build/runtime.c"; then
+    # On native Windows the CLI always copies runtime_win.c content into runtime.c
+    if grep -q 'pthread\|openssl/evp' "$TMP/build/runtime.c"; then
+      echo "error: expected runtime_win.c content, found full POSIX runtime" >&2
+      exit 1
+    fi
+  fi
+fi
+
+echo "PASS: smoke_windows_hello"