first commit.

scripts/build-phar

@@ -0,0 +1,37 @@
+#!/usr/bin/env bash
+# Construye el instalador autocontenido `duckbrain.phar` y publica su sha256.
+# Salida en `dist/` (o $DUCKBRAIN_DIST). Uso: scripts/build-phar
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+OUT="${DUCKBRAIN_DIST:-$ROOT/dist}"
+PHAR="$OUT/duckbrain.phar"
+
+mkdir -p "$OUT"
+
+php -d phar.readonly=0 -r '
+$root = $argv[1];
+$pharPath = $argv[2];
+@unlink($pharPath);
+
+$phar = new Phar($pharPath);
+$phar->startBuffering();
+$phar->setStub("#!/usr/bin/env php\n<?php Phar::mapPhar(\"duckbrain.phar\"); require \"phar://duckbrain.phar/bin/duckbrain\"; __HALT_COMPILER();");
+
+$skip = [".git/", "dist/", "tests/", "openspec/", ".opencode/", "node_modules/"];
+$iterator = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($root, FilesystemIterator::SKIP_DOTS));
+foreach ($iterator as $file) {
+    if ($file->isDir()) { continue; }
+    $rel = substr($file->getPathname(), strlen($root) + 1);
+    foreach ($skip as $prefix) {
+        if (str_starts_with($rel, $prefix)) { continue 2; }
+    }
+    $phar->addFile($file->getPathname(), $rel);
+}
+$phar->stopBuffering();
+echo "built {$pharPath}\n";
+' "$ROOT" "$PHAR"
+
+chmod +x "$PHAR"
+sha256sum "$PHAR" | awk '{print $1}' > "$PHAR.sha256"
+echo "sha256: $(cat "$PHAR.sha256")"