_write_config() was stripping trailing newlines, causing the next
add_cell_peer() to create a single-newline separator between [Interface]
and [Peer] blocks instead of the required blank line. On the following
remove_peer() call, split('\n\n') treated both sections as one block,
matched the PublicKey filter, and wrote an empty string — destroying the
[Interface] section and reverting to the hardcoded SERVER_ADDRESS fallback.
Two-part fix:
1. _write_config() always ends content with a newline
2. remove_peer() normalises single-newline [Peer] headers to blank-line
separators before splitting, and refuses to write if [Interface] would
be lost
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
roof
568e4f9783