When an lsp config file exists (e.g. ~/.omp/agent/lsp.yml), the override
path skipped root marker validation and started every non-disabled server
with a resolvable binary — regardless of whether the project matched that
server's language. This caused unrelated LSP servers to start in every
project (e.g. metals in a Java-only project, jdtls in a Rust project).
Add the same hasRootMarkers check that the auto-detect path already uses.
Adrian Glapiński
87c48cd39b