feat(core): use send_raw to fix clear action

[IvanTurko]

Summary

Fixes an issue with the default clear action sending formatted data instead of raw Ctrl+L (^L) to the REPL. Introduced send_raw function to cleanly support raw input.

Changes

• Added lowlevel.send_raw(meta, data)
• Added high-level send_raw(ft, data) wrapper
• Updated named_maps.clear to use the new method

Motivation

The current core.send wraps all output (e.g., appends \n), which breaks REPLs that interpret ^L literally (e.g., Python, IPython). This change makes clear more correct and minimal.

Thanks for the great plugin :)