Pickaxe Embed SSO WordPress Plugin v0.1.1

Fixes the WordPress shortcode for the production Pickaxe embed bundle.\n\nChanges:\n- Requires/uses the actual Pickaxe deployment ID in the shortcode: [pickaxe_embed deployment_id="deployment-your-id"]\n- Renders a deployment-* container so the production bundle can auto-mount\n- Stops treating PickaxeEmbed.mount as required; that is only used by the local mock bundle\n- Updates setup docs to call out the deployment ID requirement\n\nInstall by downloading pickaxe-embed-sso.zip and uploading it in WordPress Admin > Plugins > Add New > Upload Plugin.