<ul><li>Fixed HTTP 500: <code>Class Sdba not found</code> caused by context index.php firing without platform bootstrap</li><li>Each context folder now uses the legacy platform loader pattern: <code>index.php</code> → <code>pagedata.php</code> → <code>main.template.php</code> → <code>inc_aboutus_{context}.php</code></li><li>Created 4 files per context (16 new files total) for platform_admin, tenant_admin, tenant_member, tenant_public</li><li><code>index.php</code>: bootstraps platform autoloader, chdir to platform/, auth check, dispatches via pagedata</li><li><code>pagedata.php</code>: page metadata array matching legacy pattern</li><li><code>main.template.php</code>: delegates to real <code>platform/main.template.php</code> for admin contexts; minimal public wrapper for tenant_public</li><li><code>inc_aboutus_{context}.php</code>: content file — invokes context controller (analogous to legacy inc_aboutus_manager.php)</li><li>All PHP files pass syntax check. Legacy files untouched.</li></ul>