diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 04b7f63..747c375 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -10,6 +10,10 @@ on:
 permissions:
   contents: read
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   build:
     name: build (${{ matrix.python-version }})
diff --git a/src/diff_risk_dashboard/cli.py b/src/diff_risk_dashboard/cli.py
index 13bcca4..6b096fd 100644
--- a/src/diff_risk_dashboard/cli.py
+++ b/src/diff_risk_dashboard/cli.py
@@ -1,223 +1,62 @@
+from __future__ import annotations
+
 import argparse
 import json
+import pathlib
 import sys
-from pathlib import Path
-from typing import Any
-
-from rich.box import ROUNDED
-from rich.console import Console
-from rich.table import Table
-from rich.text import Text
-
-from .report import to_markdown
-
-_SEVERITIES = ["CRITICAL", "HIGH", "MEDIUM", "LOW", "INFO"]
-
-
-def _risk_emoji(risk: str) -> str:
-    return {"red": "🔴", "yellow": "🟡", "green": "🟢"}.get(risk, "🟢")
-
-
-def _exit_code(risk: str) -> int:
-    return {"green": 0, "yellow": 1, "red": 2}.get(risk, 0)
-
-
-def _summarize(apv: dict) -> dict[str, int][str, int]:
-    counts: dict[str, int][str, int] = {}
-    for k, v in (apv.get("by_severity") or {}).items():
-        counts[str(k).upper()] = int(v or 0)
-    total = sum(counts.get(s, 0) for s in _SEVERITIES)
-    worst = next((s for s in _SEVERITIES if counts.get(s, 0) > 0), "INFO")
-    risk = str(apv.get("risk_level") or apv.get("risk") or "green").lower()
-    return {"total": total, "by_severity": counts, "worst": worst, "risk_level": risk}
-
-
-def _table_plain(summary: dict[str, Any]) -> str:
-    counts: dict[str, int][str, int] = {s: int(summary["by_severity"].get(s, 0)) for s in _SEVERITIES}
-    total = int(summary["total"])
-    w_sev = max(len("Severity"), max(len(s) for s in _SEVERITIES))
-    w_cnt = max(len("Count"), len(str(total)))
-    header = f'{"Severity".ljust(w_sev)}  {"Count".rjust(w_cnt)}  {"Share":>5}'
-    sep = f'{"-"*w_sev}  {"-"*w_cnt}  {"-"*5}'
-    lines = [header, sep]
-    for s in _SEVERITIES:
-        n = counts.get(s, 0)
-        pct = f"{(n/total*100):.0f}%" if total else "0%"
-        lines.append(f"{s.ljust(w_sev)}  {str(n).rjust(w_cnt)}  {pct:>5}")
-    lines.append(
-        f'{"TOTAL".ljust(w_sev)}  {str(total).rjust(w_cnt)}  ' f'{"100%" if total else "0%":>5}'
-    )
-    return "\n".join(lines)
-
-
-def _bar_plain(summary: dict[str, Any], width: int = 80) -> str:
-    counts: dict[str, int][str, int] = {s: int(summary["by_severity"].get(s, 0)) for s in _SEVERITIES}
-    total = int(summary["total"])
-    maxc = max(counts.values()) if counts else 0
-    bar_w = max(10, min(40, width - 24))
-    lines = []
-    for s in _SEVERITIES:
-        n = counts.get(s, 0)
-        w = 0 if maxc == 0 or n == 0 else max(1, round(n / maxc * bar_w))
-        pct = f"{(n/total*100):.0f}%" if total else "0%"
-        lines.append(f"{s:<8} {str(n).rjust(4)} {pct:>4}  " + ("█" * w))
-    lines.append(f'{"TOTAL":<8} {str(total).rjust(4)} 100%')
-    return "\n".join(lines)
-
-
-def _table_rich(summary: dict[str, Any], width: int) -> Table:
-    counts: dict[str, int][str, int] = {s: int(summary["by_severity"].get(s, 0)) for s in _SEVERITIES}
-    total = int(summary["total"])
-    worst = str(summary.get("worst", "UNKNOWN")).upper()
-    risk = str(summary.get("risk", summary.get("risk_level", "green")) or "green").lower()
-    emoji = _risk_emoji(risk)
-    colors = {
-        "CRITICAL": "bold bright_red",
-        "HIGH": "red3",
-        "MEDIUM": "yellow3",
-        "LOW": "green3",
-        "INFO": "cyan3",
-    }
-    maxc = max(counts.values()) if counts else 0
-    bar_w = max(10, min(32, width - 42))
-
-    def bar(n: int) -> str:
-        if maxc == 0 or n == 0:
-            return ""
-        w = max(1, round(n / maxc * bar_w))
-        return "█" * w
-
-    title = Text.assemble(
-        ("Diff Risk Dashboard ", "bold"),
-        (emoji + " ",),
-        ("— Worst: ", "dim"),
-        (worst, "bold"),
-    )
-    table = Table(
-        title=title,
-        header_style="bold cyan",
-        box=ROUNDED,
-        expand=True,
-        show_lines=False,
-        pad_edge=False,
-    )
-    table.add_column("Severity", justify="left", no_wrap=True)
-    table.add_column("Count", justify="right")
-    table.add_column("Share", justify="right")
-    table.add_column("Bar", justify="left", no_wrap=True)
-    for s in _SEVERITIES:
-        n = counts.get(s, 0)
-        pct = f"{(n/total*100):.0f}%" if total else "0%"
-        col = colors.get(s, "")
-        table.add_row(
-            f"[{col}]{s}[/]",
-            f"[{col}]{n}[/]",
-            f"[{col}]{pct}[/]",
-            f"[{col}]{bar(n)}[/]",
-        )
-    table.add_row(
-        "[bold]TOTAL[/bold]",
-        f"[bold]{total}[/bold]",
-        "[bold]100%[/bold]" if total else "0%",
-        "",
-    )
-    return table
-
-
-def _bar_rich(summary: dict[str, Any], width: int) -> None:
-    console = Console()
-    counts: dict[str, int][str, int] = {s: int(summary["by_severity"].get(s, 0)) for s in _SEVERITIES}
-    total = int(summary["total"])
-    maxc = max(counts.values()) if counts else 0
-    bar_w = max(10, min(40, width - 24))
-    colors = {
-        "CRITICAL": "bright_red",
-        "HIGH": "red3",
-        "MEDIUM": "yellow3",
-        "LOW": "green3",
-        "INFO": "cyan3",
-    }
-    for s in _SEVERITIES:
-        n = counts.get(s, 0)
-        w = 0 if maxc == 0 or n == 0 else max(1, round(n / maxc * bar_w))
-        pct = f"{(n/total*100):.0f}%" if total else "0%"
-        console.print(
-            f"[{colors[s]}]{s:<8}[/] "
-            f"[{colors[s]}]{n:>4} {pct:>4}[/]  "
-            f"[{colors[s]}]{'█'*w}[/]"
-        )
-    console.print(f"[bold]TOTAL[/bold] {total:>4} 100%")
-
-
-def main() -> int:
-    p = argparse.ArgumentParser(
-        prog="diff_risk_dashboard",
-        description="Diff Risk Dashboard (APV JSON -> summary)",
-    )
-    p.add_argument("input", help="Path o texto JSON de ai-patch-verifier")
-    p.add_argument(
-        "-f",
-        "--format",
-        choices=["table", "json", "md", "bar"],
-        default="table",
-        help="Formato de salida",
-    )
-    p.add_argument(
-        "-o",
-        "--output",
-        default="-",
-        help="Archivo de salida; '-' = stdout",
-    )
-    p.add_argument(
-        "--no-exit-by-risk",
-        action="store_true",
-        help="No ajustar el exit code por nivel de riesgo",
-    )
-    args = p.parse_args()
-
-    apv = (
-        json.loads(Path(args.input).read_text(encoding="utf-8"))
-        if Path(args.input).exists()
-        else json.loads(args.input)
-    )
-    summary = _summarize(apv)
-    fmt = args.format.lower()
-    out: str | None = None
-
-    if fmt == "table":
-        if args.output == "-" and sys.stdout.isatty():
-            console = Console()
-            console.print(_table_rich(summary, console.width))
-            console.print(
-                Text(
-                    "Tip: usa  -f md  para reporte Markdown o  -f json  para máquinas.",
-                    style="dim",
-                )
-            )
-        else:
-            out = _table_plain(summary) + "\n"
-    elif fmt == "bar":
-        if args.output == "-" and sys.stdout.isatty():
-            _bar_rich(summary, Console().width)
-        else:
-            out = _bar_plain(summary) + "\n"
-    elif fmt == "json":
-        out = json.dumps(summary, indent=2, ensure_ascii=False) + "\n"
-    elif fmt == "md":
-        out = to_markdown(summary) + "\n"
+from collections.abc import Mapping
+from typing import Any, TypedDict, cast
+
+from .report import to_json, to_markdown
+
+
+class SeveritySummary(TypedDict):
+    total: int
+    by_severity: Mapping[str, int]
+
+
+def _extract_findings(data: object) -> list[Mapping[str, Any]]:
+    if isinstance(data, list):
+        return [cast(Mapping[str, Any], x) for x in data]
+    if isinstance(data, dict):
+        maybe = data.get("findings")
+        if isinstance(maybe, list):
+            return [cast(Mapping[str, Any], x) for x in maybe]
+    return []
+
+
+def summarize_apv_json(data: object) -> SeveritySummary:
+    findings = _extract_findings(data)
+    counts: dict[str, int] = {}
+    for f in findings:
+        sev = str(f.get("severity", "unknown")).lower()
+        counts[sev] = counts.get(sev, 0) + 1
+    return {"total": len(findings), "by_severity": cast(Mapping[str, int], counts)}
+
+
+def main(argv: list[str] | None = None) -> int:
+    parser = argparse.ArgumentParser(prog="diff-risk")
+    parser.add_argument("input", help="APV JSON file")
+    parser.add_argument("-f", "--format", choices=["md", "json"], default="md")
+    parser.add_argument("-o", "--output", help="Output path", default="-")
+    args = parser.parse_args(argv)
+
+    data = json.loads(pathlib.Path(args.input).read_text(encoding="utf-8"))
+    summary = summarize_apv_json(data)
+    rendered = to_markdown(summary) if args.format == "md" else to_json(summary) + "\n"
+
+    if args.output == "-" or args.output == "":
+        sys.stdout.write(rendered)
     else:
-        out = _table_plain(summary) + "\n"
-
-    if out is not None:
-        if args.output == "-":
-            sys.stdout.write(out)
-        else:
-            Path(args.output).parent.mkdir(parents=True, exist_ok=True)
-            Path(args.output).write_text(out, encoding="utf-8")
-            print(f"Wrote {args.output}")
-
-    if not args.no_exit_by_risk:
-        return _exit_code(str(summary.get("risk", summary.get("risk_level", "green"))).lower())
+        pathlib.Path(args.output).write_text(rendered, encoding="utf-8")
+
+    try:
+        from rich.console import Console
+        from rich.text import Text
+
+        Console().print(Text.assemble("Wrote ", (str(args.output), "bold")))
+    except Exception:
+        pass
     return 0