feat(codex): create and customize Codex config from /settings
Adds the Codex config panel (skills/agents/rules/memory/config editing, mcp/plugins/marketplaces add-remove via the codex CLI) as the last piece of parity with the Claude Code settings tab, plus the codex_config_changed WebSocket type the client was missing, and docs for the new /api/codex-config surface.
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