feat(core): rework workspace integration and adaptor interface (anomalyco#15895)

Author: jlongster

packages/opencode/migration/20260303231226_add_workspace_fields/migration.sql

@@ -0,0 +1,5 @@
+ALTER TABLE `workspace` ADD `type` text NOT NULL;--> statement-breakpoint
+ALTER TABLE `workspace` ADD `name` text;--> statement-breakpoint
+ALTER TABLE `workspace` ADD `directory` text;--> statement-breakpoint
+ALTER TABLE `workspace` ADD `extra` text;--> statement-breakpoint
+ALTER TABLE `workspace` DROP COLUMN `config`;