chore: import upstream snapshot with attribution

plugins/codex/commands/transfer.md

@@ -0,0 +1,10 @@
+---
+description: Transfer the current Claude Code session into a resumable Codex thread
+argument-hint: "[--source <claude-jsonl>]"
+disable-model-invocation: true
+allowed-tools: Bash(node:*)
+---
+
+!`node "${CLAUDE_PLUGIN_ROOT}/scripts/codex-companion.mjs" transfer "$ARGUMENTS"`
+
+Present the command output to the user exactly as returned. Preserve the Codex session ID and the `codex resume <session-id>` command.