fix(codex): make host-credential bottles actually authenticate

Debugging a live codex smolmachines bottle surfaced three independent
failures past the sign-in screen; fix each so forward_host_credentials
works end to end:

- codex_auth: dummy access/id tokens now inherit the *real* host token's
  exp instead of now+1h. Codex (0.135) refreshes when its local token's
  JWT exp lapses; with a placeholder refresh_token that refresh fails and
  drops to the sign-in screen. Aligning exp tracks the real token's life.

- prepare: set CODEX_CA_CERTIFICATE to the agent CA bundle for codex
  bottles. Codex is rustls and ignores the system store / NODE_EXTRA_CA_
  CERTS; it reads CODEX_CA_CERTIFICATE (fallback SSL_CERT_FILE) for custom
  roots across HTTPS + wss, so it must be pointed at the egress MITM CA or
  injection can't work without tls_passthrough.

- pipelock: auto tls_passthrough the Codex API hosts when
  forward_host_credentials is on. Egress injects the bearer before
  pipelock, whose header DLP then flags the JWT ("request header contains
  secret") and the retry storm trips its 429. passthrough host-gates the
  CONNECT but skips decrypt+rescan of egress-owned auth. The auto-added
  routes aren't in bottle.egress.routes, so the hosts are added explicitly.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

bot_bottle/backend/smolmachines/provision/provider_auth.py

@@ -4,6 +4,7 @@ from __future__ import annotations
 
 import os
 
+from ....log import die
 from .. import smolvm as _smolvm
 from ..bottle_plan import SmolmachinesBottlePlan
 
@@ -28,3 +29,21 @@ def provision_provider_auth(plan: SmolmachinesBottlePlan, target: str) -> None:
     _smolvm.machine_cp(str(plan.codex_auth_file), f"{target}:{auth_path}")
     _smolvm.machine_exec(target, ["chown", "node:node", auth_path])
     _smolvm.machine_exec(target, ["chmod", "600", auth_path])
+    result = _smolvm.machine_exec(
+        target,
+        [
+            "runuser", "-u", "node", "--",
+            "env",
+            f"HOME={guest_home}",
+            f"CODEX_HOME={auth_dir}",
+            "codex", "login", "status",
+        ],
+    )
+    if result.returncode != 0:
+        detail = (result.stderr or result.stdout).strip()
+        if detail:
+            detail = f": {detail}"
+        die(
+            "codex host credentials: dummy auth was copied into the "
+            f"smolmachine, but Codex did not accept it{detail}"
+        )