feat(design-system): DESIGN_SYSTEM.md + prompts + extract-design command

- frontend/DESIGN_SYSTEM.md: contrato del @fn_library (regla suprema para
  Claude Design y agentes).
- frontend/design_prompts/: 11 plantillas de prompt (onboarding, dashboard,
  crud, detail, settings, auth, error, custom, handoff_integrate) +
  questionnaire numerado para arranque rapido.
- .claude/commands/extract-design.md: workflow de 10 pasos para extraer
  componentes nuevos y mejoras desde exports "standalone" de Claude Design
  al registry, sync al espejo fn-design-system y push a gitea+github.
- .claude/scripts/extract_design_bundle.py: decodificador del bundle
  (base64+gzip en manifest, nombra JSX por heuristica de header).
- .gitignore: ignorar subrepos/*/ (el mirror fn-design-system es repo
  propio con remotes dataforge/fn-design-system + gutierenmanuel/fn-design-system).

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

.claude/scripts/extract_design_bundle.py

@@ -0,0 +1,159 @@
+#!/usr/bin/env python3
+"""
+Extract Claude Design "standalone" HTML exports.
+
+Claude Design packs the whole React app as base64+gzip blobs inside
+<script type="__bundler/manifest"> tags. This script decompresses them
+and writes each asset (JSX, CSS, fonts) to a target directory.
+
+Usage:
+    python3 extract_design_bundle.py <path/to/export.html> <output_dir>
+
+The output dir will contain:
+    data.jsx              (if detected by header comment)
+    fn_library_emu.jsx    (lib emulation)
+    charts_emu.jsx        (charts emulation)
+    app.jsx               (main tree)
+    <uuid>.<ext>          (anything else — fonts, unknown js)
+    manifest.json         (summary of all assets: uuid, mime, bytes, filename)
+
+JSX files are named heuristically from their leading comment. If names
+cannot be inferred from headers, they keep their uuid prefix.
+"""
+from __future__ import annotations
+
+import base64
+import gzip
+import json
+import pathlib
+import re
+import sys
+
+
+MIME_TO_EXT = {
+    "text/javascript": "js",
+    "application/javascript": "js",
+    "text/babel": "jsx",
+    "application/json": "json",
+    "text/css": "css",
+    "image/svg+xml": "svg",
+    "font/woff2": "woff2",
+    "font/woff": "woff",
+    "text/html": "html",
+}
+
+# Order matters: first matching hint wins. Put MORE SPECIFIC patterns first.
+HEADER_HINTS = [
+    ("charts_emu.jsx",     [r"Emulaci(ó|o)n de @fn_library/\{", r"LineChart, AreaChart, BarChart"]),
+    ("fn_library_emu.jsx", [r"Emulaci(ó|o)n visual de @fn_library"]),
+    ("data.jsx",           [r"mock data \(determinista\)", r"window\.\w+Data\s*="]),
+    ("app.jsx",            [r"ReactDOM\.createRoot", r"arbol principal", r"function App\s*\("]),
+]
+
+
+def pick_name(content: str, used_names: set[str]) -> str | None:
+    head = content[:2000]
+    for name, patterns in HEADER_HINTS:
+        if name in used_names:
+            continue
+        if any(re.search(p, head, re.IGNORECASE) for p in patterns):
+            return name
+    return None
+
+
+def grab_script(html: str, kind: str) -> str | None:
+    m = re.search(
+        r'<script type="__bundler/' + kind + r'">\s*(.*?)\s*</script>',
+        html, re.DOTALL,
+    )
+    return m.group(1) if m else None
+
+
+def extract(html_path: pathlib.Path, out_dir: pathlib.Path) -> dict:
+    html = html_path.read_text(encoding="utf-8")
+
+    manifest_raw = grab_script(html, "manifest")
+    if not manifest_raw:
+        raise SystemExit(f"No <script type='__bundler/manifest'> found in {html_path}")
+    manifest = json.loads(manifest_raw)
+
+    ext_raw = grab_script(html, "ext_resources")
+    ext_resources = json.loads(ext_raw) if ext_raw else []
+    id_map = {e["uuid"]: e.get("id", e["uuid"]) for e in ext_resources}
+
+    out_dir.mkdir(parents=True, exist_ok=True)
+
+    summary = []
+    used_names: set[str] = set()
+
+    # First pass: decode all assets and collect jsx blobs (so we can name them by header hint)
+    decoded: list[tuple[str, str, bytes]] = []  # (uuid, mime, bytes)
+    for uuid, entry in manifest.items():
+        raw = base64.b64decode(entry["data"])
+        if entry.get("compressed"):
+            raw = gzip.decompress(raw)
+        decoded.append((uuid, entry.get("mime", "application/octet-stream"), raw))
+
+    # Second pass: write files with heuristic names for known jsx
+    for uuid, mime, raw in decoded:
+        ext = MIME_TO_EXT.get(mime, "bin")
+        filename = None
+
+        # Heuristic for JSX / JS that represents the app
+        if ext in ("jsx", "js"):
+            try:
+                text = raw.decode("utf-8", errors="replace")
+                name = pick_name(text, used_names)
+                if name:
+                    filename = name
+                    used_names.add(name)
+            except Exception:
+                pass
+
+        if not filename:
+            # Fall back to ext_resources id if present, or uuid
+            base = id_map.get(uuid, uuid)
+            safe = re.sub(r"[^A-Za-z0-9._-]", "_", base)[:80]
+            filename = f"{safe}.{ext}"
+
+        path = out_dir / filename
+        # Avoid collisions
+        i = 2
+        while path.exists():
+            stem = path.stem
+            path = out_dir / f"{stem}_{i}.{ext}"
+            i += 1
+        path.write_bytes(raw)
+        summary.append({
+            "uuid": uuid,
+            "mime": mime,
+            "bytes": len(raw),
+            "filename": path.name,
+        })
+
+    (out_dir / "manifest.json").write_text(
+        json.dumps({"source": str(html_path), "assets": summary}, indent=2),
+        encoding="utf-8",
+    )
+    return {"assets": summary, "out": str(out_dir)}
+
+
+def main():
+    if len(sys.argv) < 3:
+        print(__doc__)
+        sys.exit(2)
+    html = pathlib.Path(sys.argv[1])
+    out = pathlib.Path(sys.argv[2])
+    if not html.exists():
+        sys.exit(f"Input not found: {html}")
+    result = extract(html, out)
+    print(f"✓ Extracted {len(result['assets'])} assets to {result['out']}")
+    print(f"  Manifest: {out}/manifest.json")
+    print()
+    # Short preview per asset
+    for a in result["assets"]:
+        print(f"  {a['mime']:28s} {a['bytes']:>8} B  {a['filename']}")
+
+
+if __name__ == "__main__":
+    main()