feat(egress-proxy): cutover from cred-proxy (PRD 0017 chunk 2)

Hard cutover. cred-proxy is deleted; egress-proxy is now the agent's
HTTP_PROXY (when routes are declared) with pipelock on its outbound
leg. Two per-bottle CAs are minted: egress-proxy's (agent trust
store) and pipelock's (egress-proxy's outbound trust store).

Manifest:
  - `bottle.cred_proxy` → hard error with a migration recipe.
  - `bottle.egress_proxy` is the new shape (PRD 0017 chunk 1).
  - CredProxy* types + role validators removed.

Wiring:
  - launch.py: `egress_proxy_tls_init` mints the egress-proxy CA
    (cert+key concat for mitmproxy + cert-only for agent trust);
    `DockerEgressProxy.start` docker-cps both CAs in, sets
    `HTTPS_PROXY=pipelock` + `EGRESS_PROXY_UPSTREAM_CA` so mitmdump
    trusts pipelock's MITM. Agent's HTTP_PROXY points at
    egress-proxy when routes exist, else falls back to pipelock
    (no-routes bottles unchanged).
  - prepare.py / backend.py: `cred_proxy` arg → `egress_proxy`;
    sidecar-orphan probe + plan field + dashboard view all
    renamed.
  - provision_ca: selects the egress-proxy CA when present, else
    pipelock's (filename renamed to claude-bottle-mitm-ca.crt).
  - bottle.provision: cred-proxy dotfile rewrites (~/.npmrc,
    ~/.gitconfig insteadOf, tea config) are gone — HTTP_PROXY
    catches everything respecting it.

Pipelock helpers:
  - `pipelock_token_hosts` → `pipelock_route_hosts` (now reading
    egress_proxy.routes).
  - cred-proxy hostname auto-allow → egress-proxy hostname
    auto-allow.
  - Anthropic seed-phrase workaround now triggers when an
    egress_proxy route targets api.anthropic.com (was based on the
    cred-proxy `anthropic-base-url` role).

Dockerfile.egress-proxy:
  - Entrypoint conditionally passes
    `--set ssl_verify_upstream_trusted_ca=$EGRESS_PROXY_UPSTREAM_CA`
    (via the `${VAR:+...}` shell expansion) so standalone runs without
    a mounted pipelock CA still boot.
  - mkdirs `/home/mitmproxy/.mitmproxy` ahead of `docker cp`.

Deleted: claude_bottle/{cred_proxy,cred_proxy_server}.py,
backend/docker/{cred_proxy,provision/cred_proxy}.py,
Dockerfile.cred-proxy, plus the corresponding unit + integration
tests. backend/docker/cred_proxy_apply.py stays as a stub for
chunk 3 to rewrite (its container-name + routes-path constants
are inlined so it survives without the deleted module).

Test changes:
  - test_pipelock_allowlist rewritten against egress-proxy routes
    + the new `pipelock_route_hosts`.
  - test_manifest_md_load + test_pipelock_yaml + test_yaml_subset
    fixtures migrated to the `egress_proxy: { routes: [...] }`
    shape.
  - test_supervise_sidecar's round-trip test switched from
    `dashboard.approve` to `dashboard.reject`: the approval-apply
    path on cred-proxy-block proposals hits a deleted sidecar in
    chunk 2's transitional state. Chunk 3 restores the approval
    test once the remediation flow is retargeted at egress-proxy.

376 tests pass (was 427; net delta is removed cred-proxy tests).

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

tests/unit/test_yaml_subset.py

@@ -252,18 +252,18 @@ class TestRealisticBottleFile(unittest.TestCase):
 
     def test_dev_bottle(self):
         out = _y("""
-            cred_proxy:
+            egress_proxy:
               routes:
-                - path: /anthropic/
-                  upstream: https://api.anthropic.com
-                  auth_scheme: Bearer
-                  token_ref: CLAUDE_BOTTLE_OAUTH_TOKEN
-                  role: anthropic-base-url
-                - path: /gitea/dideric/
-                  upstream: https://gitea.dideric.is
-                  auth_scheme: token
-                  token_ref: GITEA_TOKEN
-                  role: [git-insteadof, tea-login]
+                - host: api.anthropic.com
+                  auth:
+                    scheme: Bearer
+                    token_ref: CLAUDE_CODE_OAUTH_TOKEN
+                - host: gitea.dideric.is
+                  auth:
+                    scheme: token
+                    token_ref: GITEA_TOKEN
+                  path_allowlist:
+                    - /didericis/
             git:
               - Name: claude-bottle
                 Upstream: ssh://git@gitea.dideric.is:30009/x/y.git
@@ -275,10 +275,14 @@ class TestRealisticBottleFile(unittest.TestCase):
                 - example.com
         """)
         # Spot-check the deep parts; the structure is large.
-        self.assertEqual(2, len(out["cred_proxy"]["routes"]))
+        self.assertEqual(2, len(out["egress_proxy"]["routes"]))
         self.assertEqual(
-            ["git-insteadof", "tea-login"],
-            out["cred_proxy"]["routes"][1]["role"],
+            ["/didericis/"],
+            out["egress_proxy"]["routes"][1]["path_allowlist"],
+        )
+        self.assertEqual(
+            "Bearer",
+            out["egress_proxy"]["routes"][0]["auth"]["scheme"],
         )
         self.assertEqual(
             "100.78.141.42",