fix(codex): resync pool entry from auth.json after reauth (#17001)

When openai-codex tokens expire or the ChatGPT account hits a 429
window, the pool entry gets marked STATUS_EXHAUSTED with
last_error_reset_at many hours in the future. If the user then runs
`hermes model` / `hermes auth openai-codex` to reauth, fresh tokens
land in ~/.hermes/auth.json but the pool entry stayed frozen behind
its reset_at — every request kept failing with 'credential pool: no
available entries (all exhausted or empty)' until the original window
elapsed.

_available_entries() already had auth.json/credentials-file resync
branches for anthropic/claude_code and nous/device_code; openai-codex
was missing. Added _sync_codex_entry_from_auth_store() mirroring the
nous version (reads state["tokens"][{access,refresh}_token] +
state["last_refresh"]) and wired it into the exhausted-entry resync
loop.

Also softens the 'codex CLI not found' doctor warning — native
device-code OAuth does not require the Codex binary, only
importing existing Codex CLI tokens does. Downgraded to an info line.

Reported on Discord by p1aceho1der: Codex stalled indefinitely after
a rate-limit reset, reauth didn't help, and doctor falsely warned
that the codex CLI was required.

Co-authored-by: teknium1 <teknium@users.noreply.github.com>

agent/credential_pool.py

@@ -456,6 +456,70 @@ class CredentialPool:
             logger.debug("Failed to sync from credentials file: %s", exc)
         return entry
 
+    def _sync_codex_entry_from_auth_store(self, entry: PooledCredential) -> PooledCredential:
+        """Sync a Codex device_code pool entry from auth.json if tokens differ.
+
+        When a Codex OAuth access token expires (or the ChatGPT account hits
+        its 5h/weekly quota), the pool entry gets marked ``STATUS_EXHAUSTED``
+        with a ``last_error_reset_at`` that can be many hours in the future.
+        Meanwhile the user may run ``hermes model`` / ``hermes auth`` which
+        performs a fresh device-code login and writes new tokens to
+        ``auth.json`` under ``_auth_store_lock``.  Without this sync the pool
+        entry stays frozen until ``last_error_reset_at`` elapses — even
+        though fresh credentials are sitting on disk — and every request
+        fails with "no available entries (all exhausted or empty)".
+
+        Mirrors the Nous/Anthropic resync paths above.  Only applies to
+        device_code-sourced entries; env/API-key-sourced entries have no
+        auth.json shadow to sync from.
+        """
+        if self.provider != "openai-codex" or entry.source != "device_code":
+            return entry
+        try:
+            with _auth_store_lock():
+                auth_store = _load_auth_store()
+                state = _load_provider_state(auth_store, "openai-codex")
+            if not isinstance(state, dict):
+                return entry
+            tokens = state.get("tokens")
+            if not isinstance(tokens, dict):
+                return entry
+            store_access = tokens.get("access_token", "")
+            store_refresh = tokens.get("refresh_token", "")
+            # Adopt auth.json tokens when either side differs.  Codex refresh
+            # tokens are single-use too, so a fresh refresh_token from
+            # another process means our entry's pair is consumed/stale.
+            entry_access = entry.access_token or ""
+            entry_refresh = entry.refresh_token or ""
+            if store_access and (
+                store_access != entry_access
+                or (store_refresh and store_refresh != entry_refresh)
+            ):
+                logger.debug(
+                    "Pool entry %s: syncing Codex tokens from auth.json "
+                    "(refreshed by another process)",
+                    entry.id,
+                )
+                field_updates: Dict[str, Any] = {
+                    "access_token": store_access,
+                    "refresh_token": store_refresh or entry.refresh_token,
+                    "last_status": None,
+                    "last_status_at": None,
+                    "last_error_code": None,
+                    "last_error_reason": None,
+                    "last_error_message": None,
+                    "last_error_reset_at": None,
+                }
+                if state.get("last_refresh"):
+                    field_updates["last_refresh"] = state["last_refresh"]
+                updated = replace(entry, **field_updates)
+                self._replace_entry(entry, updated)
+                self._persist()
+                return updated
+        except Exception as exc:
+            logger.debug("Failed to sync Codex entry from auth.json: %s", exc)
+        return entry
+
     def _sync_nous_entry_from_auth_store(self, entry: PooledCredential) -> PooledCredential:
         """Sync a Nous pool entry from auth.json if tokens differ.
 
@@ -788,6 +852,18 @@ class CredentialPool:
                 if synced is not entry:
                     entry = synced
                     cleared_any = True
+            # For openai-codex entries, same pattern: the user may have
+            # re-authed via `hermes model` / `hermes auth` after a 429/401,
+            # leaving fresh tokens on disk while the pool entry is still
+            # frozen behind last_error_reset_at (can be hours in the
+            # future for ChatGPT weekly windows).
+            if (self.provider == "openai-codex"
+                    and entry.source == "device_code"
+                    and entry.last_status == STATUS_EXHAUSTED):
+                synced = self._sync_codex_entry_from_auth_store(entry)
+                if synced is not entry:
+                    entry = synced
+                    cleared_any = True
             if entry.last_status == STATUS_EXHAUSTED:
                 exhausted_until = _exhausted_until(entry)
                 if exhausted_until is not None and now < exhausted_until: