Add configurable memory versions with isolated storage (#43797)

## What changed

- Add `memories.version` with `v1` as the default and `v2` as an opt-in selection.
- Route memory generation, summaries, and retrieval tools through the selected version. Store `v2` artifacts in `memories_v2` and lazily create a separate SQLite database, keeping jobs and outputs isolated while sharing the thread catalog.
- Preserve the initial memory version across extension config updates so summaries and retrieval tools use the same namespace.
- Clear both versions on memory reset and remove thread memory from both stores on thread deletion. Recognize both artifact roots in shell usage telemetry.

## Testing

Add regression coverage for version defaults and validation, independent job claims and outputs, deletion and reset across versions, and shell usage classification for both memory roots.

GitOrigin-RevId: aa799bf87ab6ec10c8f5668213931e57547d080b

codex-rs/core/src/config/config_tests.rs

@@ -334,6 +334,7 @@ consolidation_model = "gpt-5.2"
         toml::from_str::<ConfigToml>(memories).expect("TOML deserialization should succeed");
     assert_eq!(
         Some(MemoriesToml {
+            version: None,
             disable_on_external_context: Some(true),
             generate_memories: Some(false),
             use_memories: Some(false),
@@ -360,6 +361,7 @@ consolidation_model = "gpt-5.2"
     assert_eq!(
         config.memories,
         MemoriesConfig {
+            version: codex_protocol::MemoryVersion::V1,
             disable_on_external_context: true,
             generate_memories: false,
             use_memories: false,

codex-rs/core/src/config/mod.rs

@@ -87,7 +87,6 @@ use codex_mcp::McpPluginAttribution;
 use codex_mcp::McpProtocolMode;
 use codex_mcp::McpServerRegistration;
 use codex_mcp::ResolvedMcpCatalog;
-use codex_memories_read::memory_root;
 use codex_model_provider::ProviderCapabilities;
 use codex_model_provider_info::LEGACY_OLLAMA_CHAT_PROVIDER_ID;
 use codex_model_provider_info::ModelProviderInfo;
@@ -3428,7 +3427,7 @@ impl Config {
         }
 
         let memories_config: MemoriesConfig = cfg.memories.clone().unwrap_or_default().into();
-        let memories_root = memory_root(&codex_home);
+        let memories_root = codex_home.join(memories_config.version.directory_name());
 
         let profiles_are_active = effective_permission_selection.profiles_are_active(
             default_permissions_override.as_deref(),