[devmobasa]

Summary

On Nix installs, the daemon logs this warning at every start:

Another wayscriber binary exists besides this daemon (/nix/store/…-wayscriber-0.9.29/bin/.wayscriber-wrapped). Overlay spawn follows this process file; inspecting a different path with --version or --about can disagree. Other copies: /nix/store/…-wayscriber-0.9.29/bin/wayscriber

Both paths belong to one install. wrapGAppsHook4 runs wrapProgram, which
moves the binary to bin/.wayscriber-wrapped and installs a wrapper under the
original name that execs it. The daemon's current_exe() is the moved file,
and PATH finds the wrapper, so the check counted them as two copies.

Changes

src/daemon/binary_conflict.rs now skips a candidate only when it is the
wrapper of the running binary. Both files must be in the same directory, and
the running file must be named .<candidate>-wrapped, plus any _ added by
further wraps. A wrapper from another build and system copies such as
/usr/bin/wayscriber are still reported.

New tests cover:

• a wrapper and its binary
• a profile symlink to the wrapper
• a twice-wrapped binary
• another Nix build and a system copy, which are still reported
• a hidden binary with another name, which does not claim the wrapper

Validation

• cargo test -p wayscriber --lib daemon::binary_conflict: the new tests fail
  without the change and pass with it.
• ./tools/lint-and-test.sh passes.

PR #433 made the matching change in the process broker, which also has to
accept .wayscriber-wrapped when Wayscriber relaunches itself.