[codex] Add plugin id to MCP tool call items (#23737)

Add owning plugin id to MCP tool call items so we can better filter them
at plugin level.

## Summary
- add optional `plugin_id` to MCP tool-call items and legacy begin/end
events
- propagate plugin metadata into emitted core items and app-server v2
`ThreadItem::McpToolCall`
- preserve plugin ids through app-server replay/redaction paths and
regenerate v2 schema fixtures

## Testing
- `just write-app-server-schema`
- `just fmt`
- `just fix -p codex-core`
- `cargo test -p codex-protocol -p codex-app-server-protocol`
- `cargo test -p codex-app-server-protocol`
- `cargo test -p codex-core mcp_tool_call_item_includes_plugin_id --lib`
- `cargo check -p codex-tui --tests`
- `cargo check -p codex-app-server --tests`
- `git diff --check`

## Notes
- `just fix -p codex-core` completed with two non-fatal
`too_many_arguments` warnings on the touched MCP notification helpers.
- A broader `cargo test -p codex-core` run passed core unit tests, then
hit shell/sandbox/snapshot failures in the integration target.
- A broader app-server downstream run hit the existing
`in_process::tests::in_process_start_clamps_zero_channel_capacity` stack
overflow; `cargo test -p codex-exec` also hit the existing sandbox
expectation mismatch in
`thread_lifecycle_params_include_legacy_sandbox_when_no_active_profile`.

codex-rs/app-server-protocol/src/protocol/v2/tests.rs

@@ -2491,6 +2491,7 @@ fn core_turn_item_into_thread_item_converts_supported_variants() {
         tool: "tool".to_string(),
         arguments: json!({"arg": "value"}),
         mcp_app_resource_uri: Some("app://connector".to_string()),
+        plugin_id: Some("sample@test".to_string()),
         status: CoreMcpToolCallStatus::InProgress,
         result: None,
         error: None,
@@ -2506,6 +2507,7 @@ fn core_turn_item_into_thread_item_converts_supported_variants() {
             status: McpToolCallStatus::InProgress,
             arguments: json!({"arg": "value"}),
             mcp_app_resource_uri: Some("app://connector".to_string()),
+            plugin_id: Some("sample@test".to_string()),
             result: None,
             error: None,
             duration_ms: None,
@@ -2518,6 +2520,7 @@ fn core_turn_item_into_thread_item_converts_supported_variants() {
         tool: "tool".to_string(),
         arguments: JsonValue::Null,
         mcp_app_resource_uri: None,
+        plugin_id: None,
         status: CoreMcpToolCallStatus::Completed,
         result: Some(CallToolResult {
             content: vec![json!({"type": "text", "text": "ok"})],
@@ -2538,6 +2541,7 @@ fn core_turn_item_into_thread_item_converts_supported_variants() {
             status: McpToolCallStatus::Completed,
             arguments: JsonValue::Null,
             mcp_app_resource_uri: None,
+            plugin_id: None,
             result: Some(Box::new(McpToolCallResult {
                 content: vec![json!({"type": "text", "text": "ok"})],
                 structured_content: Some(json!({"ok": true})),