Support memory v2 in external-agent memory imports (#56414)

## Why

External-agent memory imports previously wrote only to the v1 workspace and queued only v1 consolidation, leaving the v2 pipeline without imported resources.

## What changed

- Always import selected resources into `memories_v2`. Also update `memories` when v1 is selected or a legacy workspace exists.
- Read `memories.version` for detection and import, detect pending changes across the applicable namespaces, and enqueue consolidation separately for each updated namespace.
- Combine project results across namespaces so cleanup in either can succeed while failures in either are reported.
- Adapt imported-memory consolidation instructions to the active pipeline's output format.

## Testing

Expand app-server integration coverage for v2 profiles, explicit v1 selection, default profiles, and existing legacy workspaces. Verify resource copies, consolidation queues, repeat detection, and cleanup of deleted or unscoped projects.

GitOrigin-RevId: 7e9206942d63fd55b7f2a7f5f9210b687da6a973

codex-rs/external-agent-migration/src/detect/memory.rs

@@ -1,18 +1,28 @@
 use crate::discover_external_memory_files;
+use crate::memory_import::memory_versions;
 use crate::memory_import::projects_needing_import;
 use crate::memory_import::resources_root;
 use crate::model::ExternalAgentConfigMigrationItem;
 use crate::model::ExternalAgentConfigMigrationItemType;
 use crate::model::MigrationDetails;
+use codex_protocol::MemoryVersion;
+use std::collections::BTreeSet;
 use std::io;
 use std::path::Path;
 
 pub(super) fn detect(
     codex_home: &Path,
     external_agent_home: &Path,
+    selection: MemoryVersion,
 ) -> io::Result<Option<ExternalAgentConfigMigrationItem>> {
     let memory_files = discover_external_memory_files(external_agent_home)?;
-    let memory = projects_needing_import(codex_home, &memory_files)?;
+    let mut memory = BTreeSet::new();
+    for version in memory_versions(codex_home, selection)? {
+        memory.extend(projects_needing_import(
+            &codex_home.join(version.directory_name()),
+            &memory_files,
+        )?);
+    }
     if memory.is_empty() {
         return Ok(None);
     }
@@ -22,7 +32,7 @@ pub(super) fn detect(
         description: format!(
             "Import memory files from {} to {}",
             external_agent_home.join("projects").display(),
-            resources_root(codex_home).display()
+            resources_root(&codex_home.join(MemoryVersion::V2.directory_name())).display()
         ),
         cwd: None,
         details: Some(MigrationDetails {

codex-rs/external-agent-migration/src/detect/mod.rs

@@ -59,7 +59,11 @@ impl ExternalAgentConfigService {
         if params.include_home
             && params.include_memory
             && self.source.supports_memory()
-            && let Some(item) = memory::detect(&self.codex_home, &self.external_agent_home)?
+            && let Some(item) = memory::detect(
+                &self.codex_home,
+                &self.external_agent_home,
+                self.memory_version,
+            )?
         {
             items.push(item);
             emit_migration_metric(