Mriya syncs the working tree with rsync -az --delete --filter=":- .gitignore"
so only files not matched by .gitignore patterns are transferred. Ignored
cache paths such as target/ are not deleted remotely, which keeps
pre-existing build outputs available for incremental runs. The .git directory
is excluded from transfer.
Remote commands execute through the system ssh client, and Mriya mirrors the
remote exit code. If cargo test fails remotely with exit status 101, the
local process will also exit 101. Commands run via sync_and_run automatically
cd into MRIYA_SYNC_REMOTE_PATH before execution, so callers do not need to
prefix their commands with a directory change.