feat(intel): decnet enrich CLI + GET /attackers/{ip}/intel endpoint

CLI command mirrors the reuse-correlate shape (--poll-interval, --ttl-hours,
--daemon). Run it under systemd as a sibling worker.

The API endpoint returns the most recent cached row for an attacker IP
or 404. Auth-gated via require_viewer like every other attacker route.

Also extends the worker test with a real FakeBus so the
attacker.intel.enriched publish path is exercised end-to-end (no longer
a no-op against NullBus).

decnet/cli/workers.py

@@ -82,6 +82,60 @@ def register(app: typer.Typer) -> None:
 
         asyncio.run(_run())
 
+    @app.command(name="enrich")
+    def enrich(
+        poll_interval_secs: float = typer.Option(
+            60.0, "--poll-interval", "-i",
+            help="Slow-tick fallback when the bus is idle or unavailable (seconds)",
+        ),
+        ttl_hours: int = typer.Option(
+            24, "--ttl-hours",
+            help="Cache lifetime per attacker IP — re-firings inside the window short-circuit before any HTTP egress",
+        ),
+        daemon: bool = typer.Option(
+            False, "--daemon", "-d",
+            help="Detach to background as a daemon process",
+        ),
+    ) -> None:
+        """Threat-intel enrichment worker — fan out per attacker IP across
+        configured providers (GreyNoise, AbuseIPDB, abuse.ch Feodo Tracker
+        + ThreatFox), cache the verdict in ``attacker_intel``, and publish
+        ``attacker.intel.enriched`` for SIEM-bound webhook consumers.
+        """
+        import asyncio
+        from decnet.intel.worker import run_intel_loop
+        from decnet.web.dependencies import repo
+
+        if daemon:
+            log.info(
+                "enrich daemonizing poll=%s ttl_hours=%d",
+                poll_interval_secs, ttl_hours,
+            )
+            _utils._daemonize()
+
+        log.info(
+            "enrich command invoked poll=%s ttl_hours=%d",
+            poll_interval_secs, ttl_hours,
+        )
+        console.print(
+            f"[bold cyan]Intel enrichment starting[/] "
+            f"poll={poll_interval_secs}s ttl={ttl_hours}h"
+        )
+        console.print("[dim]Press Ctrl+C to stop[/]")
+
+        async def _run() -> None:
+            await repo.initialize()
+            await run_intel_loop(
+                repo,
+                poll_interval_secs=poll_interval_secs,
+                ttl_hours=ttl_hours,
+            )
+
+        try:
+            asyncio.run(_run())
+        except KeyboardInterrupt:
+            console.print("\n[yellow]Intel enrichment stopped.[/]")
+
     @app.command(name="reuse-correlate")
     def reuse_correlate(
         min_targets: int = typer.Option(

decnet/web/router/__init__.py

@@ -20,6 +20,7 @@ from .attackers.api_get_attacker_artifacts import router as attacker_artifacts_r
 from .attackers.api_get_attacker_transcripts import router as attacker_transcripts_router
 from .attackers.api_get_attacker_smtp_targets import router as attacker_smtp_targets_router
 from .attackers.api_get_attacker_mail import router as attacker_mail_router
+from .attackers.api_get_attacker_intel import router as attacker_intel_router
 from .transcripts import transcripts_router
 from .config.api_get_config import router as config_get_router
 from .config.api_update_config import router as config_update_router
@@ -81,6 +82,7 @@ api_router.include_router(attacker_artifacts_router)
 api_router.include_router(attacker_transcripts_router)
 api_router.include_router(attacker_smtp_targets_router)
 api_router.include_router(attacker_mail_router)
+api_router.include_router(attacker_intel_router)
 
 # Observability
 api_router.include_router(stats_router)

decnet/web/router/attackers/api_get_attacker_intel.py

@@ -0,0 +1,36 @@
+"""GET /api/v1/attackers/{ip}/intel — latest threat-intel row for an IP."""
+from typing import Any
+
+from fastapi import APIRouter, Depends, HTTPException
+
+from decnet.telemetry import traced as _traced
+from decnet.web.dependencies import repo, require_viewer
+
+router = APIRouter()
+
+
+@router.get(
+    "/attackers/{ip}/intel",
+    tags=["Attacker Profiles"],
+    responses={
+        401: {"description": "Could not validate credentials"},
+        403: {"description": "Insufficient permissions"},
+        404: {"description": "No intel cached for this IP"},
+    },
+)
+@_traced("api.get_attacker_intel")
+async def get_attacker_intel(
+    ip: str,
+    user: dict = Depends(require_viewer),
+) -> dict[str, Any]:
+    """Return the most recent cached threat-intel verdict for ``ip``.
+
+    The row is populated out-of-band by the ``decnet enrich`` worker
+    (typically within seconds of first observation, sub-second when the
+    bus is healthy). 404 means either the worker has not run yet or the
+    IP has never been observed by DECNET.
+    """
+    record = await repo.get_attacker_intel_by_ip(ip)
+    if not record:
+        raise HTTPException(status_code=404, detail="No intel cached for this IP")
+    return record