fix(dist): resolve symlinks in the bundle launcher (curl install was broken)

install.sh symlinks ~/.local/bin/codegraph -> the bundle launcher, but the
launcher derived its dir from $0, which is the symlink path — so it looked for
`node` next to the symlink and failed with `exec: .../node: not found`. Follow
the symlink chain to the real bundle dir first. (npm was unaffected — the shim
invokes the launcher by absolute path.) Verified via the symlinked install path
in a clean no-Node Linux container.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

scripts/build-bundle.sh

@@ -78,7 +78,17 @@ else
   cp "$NODE_BIN" "$STAGE/node"
   cat > "$STAGE/bin/codegraph" <<'LAUNCH'
 #!/bin/sh
-DIR="$(cd "$(dirname "$0")/.." && pwd)"
+# Resolve symlinks (e.g. the ~/.local/bin/codegraph link install.sh creates) so
+# we find the real bundle dir, not the symlink's location.
+SELF="$0"
+while [ -L "$SELF" ]; do
+  target="$(readlink "$SELF")"
+  case "$target" in
+    /*) SELF="$target" ;;
+    *) SELF="$(dirname "$SELF")/$target" ;;
+  esac
+done
+DIR="$(cd "$(dirname "$SELF")/.." && pwd)"
 exec "$DIR/node" "$DIR/lib/dist/bin/codegraph.js" "$@"
 LAUNCH
   chmod +x "$STAGE/bin/codegraph"