The handler opened the target in "w" mode without looking at the body, so a
call whose content section was lost by a parser cut the file to 0 bytes and
still answered exit_code=0 (#6414). Gate the truncating open on the size the
file has on disk — the read just above it answers "" for bytes it cannot
decode, so an undecodable target would otherwise look empty — and let only an
inline-JSON content key that is literally an empty string declare the clear.
Also stop turning a null content into the four characters "None", which could
be neither refused as a lost body nor honoured as an empty write.
In src/ai_interaction.py, when parsing text-format edit or delete actions, an empty line 2 caused memory_id to resolve to empty string. Because startswith("") is always True, the first stored memory was inadvertently edited or deleted.
This change validates that memory_id is non-empty before searching the memory list, restoring parity with the MCP memory tool.
Fixes#6342.
Aashish