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/prepare.py

@@ -129,6 +129,24 @@ def resolve_plan(
     if provider.template == "claude" and has_provider_auth:
         guest_env.setdefault("CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC", "1")
         guest_env.setdefault("DISABLE_ERROR_REPORTING", "1")
+    if provider.template == "codex":
+        # Codex is a Rust/rustls client: unlike the Node agents it does
+        # NOT consult the system trust store or honor NODE_EXTRA_CA_CERTS.
+        # It reads CODEX_CA_CERTIFICATE (falling back to SSL_CERT_FILE)
+        # for custom roots, across HTTPS *and* the wss responses channel.
+        # Point it at the bundle update-ca-certificates rebuilt with the
+        # egress MITM CA so Codex trusts the proxy and egress can inject
+        # the host bearer — without this, codex bottles need
+        # pipelock tls_passthrough, which disables auth injection.
+        guest_env["CODEX_CA_CERTIFICATE"] = (
+            "/etc/ssl/certs/ca-certificates.crt"
+        )
+    if provider.template == "codex" and provider.forward_host_credentials:
+        # Smolvm exec process trees do not reliably inherit the image
+        # user's login environment. Pin CODEX_HOME to the same path
+        # provision_provider_auth writes so Codex never falls back to a
+        # root or unset home and shows the sign-in picker.
+        guest_env["CODEX_HOME"] = "/home/node/.codex"
 
     supervise_plan = None
     if bottle.supervise: