Remove the monorepo-relative spdlog fallback so this project no longer depends on ../app/lib/spdlog. This makes configuration deterministic when cvmmap-streamer is checked out as an independent repository.
The build now fails fast unless spdlog is provided by the host toolchain, which matches standalone packaging expectations.
This commit introduces the full downstream runtime implementation needed to ingest, transform, and publish streams.
It preserves the original upstream request boundary by packaging the entire cvmmap-streamer module (build config, public API, protocol and IPC glue, and simulator/tester entrypoints) in one coherent core unit.
Keeping this group isolated enables reviewers to validate runtime behavior and correctness without mixing test evidence or process documentation changes.
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
crosstyan