Feature request: shared/synced instructions between Claude Code and claude.ai profile custom instructions

Currently there's no way to define a set of user instructions/preferences once and have them apply both in Claude Code (via CLAUDE.md / settings.json) and in the claude.ai / Claude Desktop app (via profile custom instructions). Users who want consistent behavior across both surfaces have to manually maintain and copy the same content into two separate places, with no sync mechanism.

Request: support importing/syncing custom instructions (similar to the existing syncClaudeAiSkills skill-sync behavior) so a single set of user-level instructions can apply across both Claude Code and claude.ai/Desktop.