feat(supervise): list-egress-proxy-routes MCP tool, defaults on egress-proxy

Reshape the allowlist topology so the egress-proxy is the bottle's
single allowlist surface, and replace the agent-side
routes/allowlist file mounts with a live MCP tool.

Policy change (move defaults to egress-proxy):

  - `egress_proxy_routes_for_bottle(bottle)` now folds in
    DEFAULT_ALLOWLIST (the claude-code defaults) and
    `bottle.egress.allowlist` (user adds) as bare-pass routes (no
    auth, no path filter), on top of the bottle's
    `egress_proxy.routes`. Manifest routes win on host collision.
  - `pipelock_effective_allowlist(bottle)` mirrors egress-proxy's
    effective host set when egress-proxy is in use. Pipelock is
    no longer the bottle's primary allowlist authority; it
    enforces a downstream copy as defense-in-depth + does DLP body
    scanning.
  - Split out `egress_proxy_manifest_routes(bottle)` for callers
    that want just the manifest entries (tests, internal use).
  - DEFAULT_ALLOWLIST moves from `pipelock.py` to `egress_proxy.py`
    (pipelock re-imports for the no-egress-proxy fallback path).
  - Dropped the `egress-proxy` auto-allow on pipelock's allowlist
    — the agent never dials egress-proxy via the proxy mechanism;
    pipelock only sees upstream hostnames from egress-proxy's
    CONNECTs.

Introspection endpoint (existing mitmproxy feature):

  - Egress-proxy addon recognises requests to the magic host
    `_egress-proxy.local` and synthesizes responses via
    `flow.response = http.Response.make(...)` — no upstream
    connection, no allowlist enforcement on the magic host.
  - `GET /allowlist` returns the in-memory route table as JSON
    (host + path_allowlist + auth_scheme + token_env per route;
    no token VALUES).
  - Smoke-tested end-to-end against a real egress-proxy container.

MCP tool (existing supervise plumbing):

  - New `list-egress-proxy-routes` tool (no inputs, no operator
    approval). Handler fetches via egress-proxy's introspection
    endpoint using urllib's ProxyHandler against
    `EGRESS_PROXY_FORWARD_PROXY`. Returns the JSON payload as the
    tool's text content; `isError: true` if the proxy is
    unreachable.
  - `egress-proxy-block` description now points the agent at
    `list-egress-proxy-routes` instead of a staged file path.
  - `pipelock-block` description acknowledges the mirror — agents
    should prefer `egress-proxy-block` to add hosts; pipelock-block
    stays for the rare divergence case.

Drop agent-side file mounts:

  - Supervise's `current-config` dir staging no longer writes
    routes.yaml / allowlist. Only `Dockerfile` remains
    (capability-block still reads it from
    `/etc/claude-bottle/current-config/Dockerfile`).
  - `prepare.py` stops passing `routes_content` /
    `allowlist_content` to `supervise.prepare`.
  - `Supervise.prepare` signature simplified to one
    `dockerfile_content` kwarg.

Tests: 400 unit + integration pass. Added coverage for
defaults-folding (`TestRoutesForBottleFoldsDefaults`), the new
tool definition + handler, and the updated supervise.prepare
shape.

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

tests/unit/test_egress_proxy.py

@@ -5,6 +5,8 @@ import json
 import unittest
 
 from claude_bottle.egress_proxy import (
+    DEFAULT_ALLOWLIST,
+    egress_proxy_manifest_routes,
     egress_proxy_render_routes,
     egress_proxy_resolve_token_values,
     egress_proxy_routes_for_bottle,
@@ -27,7 +29,7 @@ class TestRoutesForBottle(unittest.TestCase):
             "host": "api.github.com",
             "auth": {"scheme": "Bearer", "token_ref": "GH_PAT"},
         }])
-        routes = egress_proxy_routes_for_bottle(b)
+        routes = egress_proxy_manifest_routes(b)
         self.assertEqual(1, len(routes))
         r = routes[0]
         self.assertEqual("api.github.com", r.host)
@@ -38,7 +40,7 @@ class TestRoutesForBottle(unittest.TestCase):
 
     def test_unauthenticated_route_has_empty_auth_fields(self):
         b = _bottle([{"host": "github.com", "path_allowlist": ["/x/"]}])
-        routes = egress_proxy_routes_for_bottle(b)
+        routes = egress_proxy_manifest_routes(b)
         r = routes[0]
         self.assertEqual("", r.auth_scheme)
         self.assertEqual("", r.token_env)
@@ -52,7 +54,7 @@ class TestRoutesForBottle(unittest.TestCase):
             {"host": "github.com",
              "auth": {"scheme": "Bearer", "token_ref": "GH_PAT"}},
         ])
-        routes = egress_proxy_routes_for_bottle(b)
+        routes = egress_proxy_manifest_routes(b)
         slots = {r.token_env for r in routes}
         self.assertEqual({"EGRESS_PROXY_TOKEN_0"}, slots)
 
@@ -63,7 +65,7 @@ class TestRoutesForBottle(unittest.TestCase):
             {"host": "b.example",
              "auth": {"scheme": "Bearer", "token_ref": "T2"}},
         ])
-        routes = egress_proxy_routes_for_bottle(b)
+        routes = egress_proxy_manifest_routes(b)
         slots = [r.token_env for r in routes]
         self.assertEqual(["EGRESS_PROXY_TOKEN_0", "EGRESS_PROXY_TOKEN_1"], slots)
 
@@ -77,12 +79,56 @@ class TestRoutesForBottle(unittest.TestCase):
             {"host": "b.example",
              "auth": {"scheme": "Bearer", "token_ref": "T2"}},
         ])
-        routes = egress_proxy_routes_for_bottle(b)
+        routes = egress_proxy_manifest_routes(b)
         authed = [r.token_env for r in routes if r.token_env]
         self.assertEqual(["EGRESS_PROXY_TOKEN_0", "EGRESS_PROXY_TOKEN_1"], authed)
         self.assertEqual("", routes[1].token_env)
 
 
+class TestRoutesForBottleFoldsDefaults(unittest.TestCase):
+    """The effective route table includes DEFAULT_ALLOWLIST +
+    bottle.egress.allowlist as bare-pass entries — pipelock's
+    allowlist is a mirror of this set."""
+
+    def test_defaults_present_when_no_manifest_routes(self):
+        b = _bottle([])
+        hosts = [r.host for r in egress_proxy_routes_for_bottle(b)]
+        for default in DEFAULT_ALLOWLIST:
+            self.assertIn(default, hosts)
+
+    def test_manifest_route_wins_over_default(self):
+        # api.anthropic.com is in DEFAULT_ALLOWLIST. A manifest
+        # route for the same host takes precedence — we want the
+        # auth config to apply, not a duplicate bare-pass entry.
+        b = _bottle([{
+            "host": "api.anthropic.com",
+            "auth": {"scheme": "Bearer", "token_ref": "T"},
+        }])
+        routes = egress_proxy_routes_for_bottle(b)
+        anthropic = [r for r in routes if r.host == "api.anthropic.com"]
+        self.assertEqual(1, len(anthropic))
+        self.assertEqual("Bearer", anthropic[0].auth_scheme)
+
+    def test_bottle_egress_allowlist_folded_in(self):
+        m = Manifest.from_json_obj({
+            "bottles": {"dev": {
+                "egress_proxy": {"routes": []},
+                "egress": {"allowlist": ["example.com"]},
+            }},
+            "agents": {"demo": {"skills": [], "prompt": "", "bottle": "dev"}},
+        })
+        hosts = [r.host for r in egress_proxy_routes_for_bottle(m.bottles["dev"])]
+        self.assertIn("example.com", hosts)
+
+    def test_manifest_only_when_no_defaults_or_allowlist(self):
+        # Sanity: egress_proxy_manifest_routes returns just the
+        # manifest entries — defaults are added by the
+        # _routes_for_bottle wrapper.
+        b = _bottle([{"host": "x.example"}])
+        manifest = [r.host for r in egress_proxy_manifest_routes(b)]
+        self.assertEqual(["x.example"], manifest)
+
+
 class TestTokenEnvMap(unittest.TestCase):
     def test_only_authenticated_routes_contribute(self):
         b = _bottle([
@@ -90,7 +136,7 @@ class TestTokenEnvMap(unittest.TestCase):
              "auth": {"scheme": "Bearer", "token_ref": "T1"}},
             {"host": "passthrough.example"},
         ])
-        routes = egress_proxy_routes_for_bottle(b)
+        routes = egress_proxy_manifest_routes(b)
         m = egress_proxy_token_env_map(routes)
         self.assertEqual({"EGRESS_PROXY_TOKEN_0": "T1"}, m)
 
@@ -105,7 +151,7 @@ class TestRenderRoutes(unittest.TestCase):
             "auth": {"scheme": "Bearer", "token_ref": "GH_PAT"},
             "path_allowlist": ["/repos/x/"],
         }])
-        routes = egress_proxy_routes_for_bottle(b)
+        routes = egress_proxy_manifest_routes(b)
         payload = json.loads(egress_proxy_render_routes(routes))
         self.assertEqual(
             [{
@@ -123,7 +169,7 @@ class TestRenderRoutes(unittest.TestCase):
         # enforces both-or-neither, so emitting empty strings would
         # round-trip as a partial pair and crash.
         b = _bottle([{"host": "github.com", "path_allowlist": ["/x/"]}])
-        routes = egress_proxy_routes_for_bottle(b)
+        routes = egress_proxy_manifest_routes(b)
         payload = json.loads(egress_proxy_render_routes(routes))
         entry = payload["routes"][0]
         self.assertNotIn("auth_scheme", entry)
@@ -134,7 +180,7 @@ class TestRenderRoutes(unittest.TestCase):
             "host": "api.anthropic.com",
             "auth": {"scheme": "Bearer", "token_ref": "CL"},
         }])
-        routes = egress_proxy_routes_for_bottle(b)
+        routes = egress_proxy_manifest_routes(b)
         payload = json.loads(egress_proxy_render_routes(routes))
         self.assertNotIn("path_allowlist", payload["routes"][0])
 
@@ -149,7 +195,7 @@ class TestRenderRoutes(unittest.TestCase):
             {"host": "github.com", "path_allowlist": ["/x/"]},
             {"host": "api.anthropic.com"},
         ])
-        routes = egress_proxy_routes_for_bottle(b)
+        routes = egress_proxy_manifest_routes(b)
         addon_routes = load_routes(egress_proxy_render_routes(routes))
         self.assertEqual(3, len(addon_routes))
         self.assertEqual("Bearer", addon_routes[0].auth_scheme)