feat(pipelock): enforce DLP body-scan hits by default

Adds bottle.egress.dlp_action ("block" | "warn", default block) and
wires it into pipelock as request_body_scanning.action. Pipelock's
own default is "warn", which previously meant claude-bottle detected
credential patterns in outbound bodies but forwarded the request
anyway.

The matching integration test posts a manifest env var shaped like
a GitHub PAT to api.anthropic.com via plain HTTP forward proxy so
pipelock can see the body. Pipelock answers 403 from its body-scan
layer instead of forwarding to the upstream.

Behavior change: bottles without an explicit egress.dlp_action now
block on body-scan hits. Set egress.dlp_action: "warn" to restore
the prior detect-only behavior.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

tests/integration/test_pipelock_blocks_secret_post.py

@@ -0,0 +1,133 @@
+"""Integration: pipelock blocks a POST whose body carries a
+recognized credential pattern, even when the host is on the
+allowlist.
+
+End-to-end companion to the block / allow node tests. The manifest
+carries a literal env var whose value matches pipelock's DLP rules.
+A Node script POSTs that value to an allowlisted host via plain
+HTTP forward proxy (absolute-URI form) so pipelock can scan the
+body — routing the same request over CONNECT would tunnel TLS
+opaquely and the DLP layer would have nothing to see. The 403
+return from pipelock isolates the body-scan layer as the active
+control, distinct from the host-allowlist decision the other two
+tests pin down.
+"""
+
+from __future__ import annotations
+
+import os
+import shutil
+import tempfile
+import unittest
+from pathlib import Path
+
+from claude_bottle.backend import BottleSpec, get_bottle_backend
+from claude_bottle.manifest import Manifest
+from tests._docker import skip_unless_docker
+
+
+# Synthetic value shaped like a GitHub Personal Access Token
+# (`ghp_` + 36 alnum chars). Not a real token; the only relevant
+# property is that pipelock's default DLP rules recognize the
+# shape. Kept obviously dummy so a stray grep can't mistake it
+# for a real credential.
+_FAKE_TOKEN = "ghp_aB3cD4eF5gH6iJ7kL8mN9oP0qR1sT2uV3wX4yZ"
+
+
+# Output contract (parsed by the test):
+#   - "status=<code>"   proxy answered with an HTTP response
+#   - "error=<code> <message>"  transport-level failure
+#   - "timeout"         request hung
+_PROBE_JS = r"""
+const http = require('http');
+const proxy = new URL(process.env.HTTPS_PROXY);
+const body = 'token=' + process.env.FAKE_TOKEN;
+const req = http.request({
+  host: proxy.hostname,
+  port: proxy.port,
+  method: 'POST',
+  // Absolute-URI form: pipelock acts as a plain HTTP forward proxy
+  // and the body is visible to its DLP scanner. CONNECT would
+  // tunnel TLS bytes that pipelock can't see into.
+  path: 'http://api.anthropic.com/dlp-probe',
+  headers: {
+    Host: 'api.anthropic.com',
+    'Content-Type': 'application/x-www-form-urlencoded',
+    'Content-Length': Buffer.byteLength(body),
+  },
+}, (res) => {
+  res.resume();
+  res.on('end', () => {
+    console.log('status=' + res.statusCode);
+    process.exit(0);
+  });
+});
+req.on('error', (e) => {
+  console.log('error=' + (e.code || '') + ' ' + e.message);
+  process.exit(0);
+});
+req.setTimeout(5000, () => {
+  console.log('timeout');
+  req.destroy();
+});
+req.write(body);
+req.end();
+"""
+
+
+@skip_unless_docker()
+class TestPipelockBlocksSecretPost(unittest.TestCase):
+    @unittest.skipIf(
+        os.environ.get("GITEA_ACTIONS") == "true",
+        "skipped under act_runner: docker socket mount topology breaks "
+        "in-process visibility of networks created on the host daemon",
+    )
+    def test_post_with_credential_body_is_blocked(self):
+        manifest = Manifest.from_json_obj({
+            "bottles": {
+                "dev": {"env": {"FAKE_TOKEN": _FAKE_TOKEN}},
+            },
+            "agents": {
+                "demo": {"skills": [], "prompt": "", "bottle": "dev"},
+            },
+        })
+        backend = get_bottle_backend()
+        stage_dir = Path(tempfile.mkdtemp(prefix="cb-test-stage."))
+        try:
+            spec = BottleSpec(
+                manifest=manifest,
+                agent_name="demo",
+                copy_cwd=False,
+                user_cwd=str(stage_dir),
+                forward_oauth_token=False,
+            )
+            plan = backend.prepare(spec, stage_dir=stage_dir)
+            with backend.launch(plan) as bottle:
+                script = (
+                    "set -e\n"
+                    "cat > /tmp/probe.js <<'PROBE_EOF'\n"
+                    f"{_PROBE_JS}\n"
+                    "PROBE_EOF\n"
+                    "node /tmp/probe.js\n"
+                )
+                result = bottle.exec(script)
+        finally:
+            shutil.rmtree(stage_dir, ignore_errors=True)
+
+        self.assertEqual(
+            0, result.returncode,
+            f"exec wrapper failed: stdout={result.stdout!r} stderr={result.stderr!r}",
+        )
+        # api.anthropic.com is on the baked-in allowlist, so the
+        # host-allowlist layer would have let this through. Pipelock's
+        # DLP body-scan layer must catch the credential pattern and
+        # answer 403; any other code means the body reached the
+        # upstream.
+        self.assertIn(
+            "status=403", result.stdout,
+            f"pipelock DLP should have blocked the credential POST; got: {result.stdout!r}",
+        )
+
+
+if __name__ == "__main__":
+    unittest.main()