fix(process)!: require current captures and preserve cleanup failures

Remove v3 capture conversion and require explicit executable identity and event journals. Preserve cancellation, execution diagnostics, snapshots, and cleanup outcomes from preparation through CLI delivery.

src/domain/process/processCaptureExample.ts

@@ -54,6 +54,7 @@ export const EMPTY_PROCESS_CAPTURE_EXAMPLE = {
       truncated: false,
     },
   ],
+  event_journal: [],
   files_before: [],
   files_after: [],
   filesystem_effects: [],