fix(config): preserve unmanaged Codex TOML tables

Keep foreign tables such as mcp_servers and model_providers during config
synchronization instead of dropping them; only setup-owned keys are replaced.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

scripts/lib/install-options.py

@@ -129,11 +129,9 @@ def merge_toml(current_text, managed_text, statusline_enabled=True):
         owned_hook = any(re.search(r'(?:flashbang|statusline|record-compact|session-state-pointer)\.(?:ps1|sh)', line, re.I) for line in block)
         if plugin_table and header in managed_headers:
             raise ValueError('Cannot merge conflicting managed plugin tables.')
-        if (plugin_table and header not in managed_headers) or (array_table and not owned_hook):
+        if (header not in managed_headers and not array_table) or (array_table and not owned_hook):
             extras.extend(block)
             continue
-        if header not in managed_headers:
-            continue
         if array_table:
             continue
         generated_block = next(lines for name, lines in managed_sections if name == header)