fix release pipeline: vendored cava source, fftw in CI, runner arch, smoke test

- Vendor cava/cavacore.c + header (MIT, from karlstav/cava) — the FFI build
  referenced cava/cavacore.c which was never committed, so every CI runner
  failed at scripts/build-cavacore.sh and no release was possible.
- build-cavacore.sh: discover libfftw3.a across Homebrew and Debian/Ubuntu
  multiarch paths (FFTW_PREFIX override preserved).
- release.yml: install fftw before building cavacore; run the boot smoke test
  from a bunfig-free dir (the embedded runtime reads the CWD bunfig.toml and
  this repo's preload entry breaks it — 'preload not found'); use
  macos-15-intel for darwin-x64 (macos-latest is arm64).
- Makefile/build.ts: drop the no-op BUN_CONFIG=bunfig.standalone.toml compile
  dance (Bun never honored it; compile output is config-independent); delete
  bunfig.standalone.toml.

scripts/build-cavacore.sh

@@ -19,36 +19,58 @@ mkdir -p "$OUT_DIR"
 OS="$(uname -s)"
 ARCH="$(uname -m)"
 
-# Resolve fftw3 paths
+# Resolve fftw3 paths. The static archive lives in different places per
+# platform: Homebrew (/opt/homebrew on arm64, /usr/local on Intel) and, on
+# Debian/Ubuntu, the multiarch dir /usr/lib/<triplet> (e.g.
+# x86_64-linux-gnu, aarch64-linux-gnu).
 if [ "$OS" = "Darwin" ]; then
-  if [ "$ARCH" = "arm64" ]; then
-    FFTW_PREFIX="${FFTW_PREFIX:-/opt/homebrew}"
-  else
-    FFTW_PREFIX="${FFTW_PREFIX:-/usr/local}"
-  fi
-  LIB_EXT="dylib"
-  SHARED_FLAG="-dynamiclib"
-  INSTALL_NAME="-install_name @rpath/libcavacore.dylib"
+	LIB_EXT="dylib"
+	SHARED_FLAG="-dynamiclib"
+	INSTALL_NAME="-install_name @rpath/libcavacore.dylib"
+	if [ "$ARCH" = "arm64" ]; then
+		FFTW_HINTS="/opt/homebrew /usr/local"
+	else
+		FFTW_HINTS="/usr/local /opt/homebrew"
+	fi
 else
-  FFTW_PREFIX="${FFTW_PREFIX:-/usr}"
-  LIB_EXT="so"
-  SHARED_FLAG="-shared"
-  INSTALL_NAME=""
+	LIB_EXT="so"
+	SHARED_FLAG="-shared"
+	INSTALL_NAME=""
+	FFTW_HINTS="/usr /usr/local"
+fi
+
+FFTW_PREFIX="${FFTW_PREFIX:-}"
+FFTW_STATIC=""
+if [ -n "$FFTW_PREFIX" ]; then
+	FFTW_STATIC="$FFTW_PREFIX/lib/libfftw3.a"
+else
+	for hint in $FFTW_HINTS; do
+		for cand in "$hint/lib/libfftw3.a" "$hint/lib/${ARCH}-linux-gnu/libfftw3.a"; do
+			if [ -f "$cand" ]; then
+				FFTW_STATIC="$cand"
+				FFTW_PREFIX="$hint"
+				break 2
+			fi
+		done
+	done
+fi
+
+if [ -z "$FFTW_STATIC" ] || [ ! -f "$FFTW_STATIC" ]; then
+	echo "Error: libfftw3.a not found (searched: ${FFTW_HINTS})"
+	echo "Install fftw3: brew install fftw (macOS) or apt install libfftw3-dev (Linux)"
+	echo "or point FFTW_PREFIX at a prefix containing lib/libfftw3.a."
+	exit 1
 fi
 
 FFTW_INCLUDE="$FFTW_PREFIX/include"
-FFTW_STATIC="$FFTW_PREFIX/lib/libfftw3.a"
-
-if [ ! -f "$FFTW_STATIC" ]; then
-  echo "Error: libfftw3.a not found at $FFTW_STATIC"
-  echo "Install fftw3: brew install fftw (macOS) or apt install libfftw3-dev (Linux)"
-  exit 1
+if [ ! -d "$FFTW_INCLUDE" ]; then
+	FFTW_INCLUDE="$FFTW_PREFIX/include/$(basename "$(dirname "$FFTW_STATIC")")"
 fi
 
 if [ ! -f "$SRC" ]; then
-  echo "Error: cavacore.c not found at $SRC"
-  echo "Ensure the cava submodule is initialized: git submodule update --init"
-  exit 1
+	echo "Error: cavacore.c not found at $SRC"
+	echo "The cava source is vendored under cava/ (from github.com/karlstav/cava, MIT)."
+	exit 1
 fi
 
 OUT="$OUT_DIR/libcavacore.$LIB_EXT"
@@ -59,21 +81,21 @@ echo "  FFTW3:   $FFTW_STATIC"
 echo "  Output:  $OUT"
 
 cc -O2 \
-  $SHARED_FLAG \
-  $INSTALL_NAME \
-  -fPIC \
-  -I"$FFTW_INCLUDE" \
-  -I"$ROOT/cava" \
-  -o "$OUT" \
-  "$SRC" \
-  "$FFTW_STATIC" \
-  -lm
+	$SHARED_FLAG \
+	$INSTALL_NAME \
+	-fPIC \
+	-I"$FFTW_INCLUDE" \
+	-I"$ROOT/cava" \
+	-o "$OUT" \
+	"$SRC" \
+	"$FFTW_STATIC" \
+	-lm
 
 echo "Built: $OUT"
 
 # Verify exported symbols
 if [ "$OS" = "Darwin" ]; then
-  echo ""
-  echo "Exported symbols:"
-  nm -gU "$OUT" | grep "cava_"
+	echo ""
+	echo "Exported symbols:"
+	nm -gU "$OUT" | grep "cava_"
 fi