Fix incorrect default Claude Desktop config path — macOS uses
~/Library/Application Support/Claude/claude_desktop_config.json,
not ~/.config/Claude/claude_desktop_config.json.
Capture stderr in merge_config subshell (2>&1) so Python tracebacks
and interpreter errors are surfaced instead of silently dropped when
the command substitution fails under set -e.
Update README.md and docs/PLATFORM_GUIDE.md to reflect the corrected
macOS config path, and split the combined Linux/macOS config location
reference into separate per-platform entries.
Add trailing newline at the end.
e28df51eb1