test: add readme and fix examples on macos

[rlve]

No description provided.

[Copilot]

Pull request overview

This PR adds a tests/README.md to document how to run the Qt-based test suite, and fixes the macOS development shell (nix develop) by replicating the install_name_tool rpath fixup — already present in preConfigure for the build — into the shellHook as well, so that dylib files are correctly configured when working in the dev shell on macOS.

Changes:

• Added tests/README.md documenting ctest and direct-executable invocation for all three test targets.
• Extended flake.nix's devShells.default.shellHook to run install_name_tool -id "@rpath/..." on copied .dylib files, mirroring the existing macOS fix in preConfigure.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
tests/README.md	New file documenting how to run the async, sync, and integration tests via ctest or directly.
flake.nix	Adds the macOS install_name_tool rpath fixup block to the dev shell's shellHook to mirror the build-time fix.

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The one minor observation is in tests/README.md: the commands (e.g., ctest --test-dir build, ./build/async) must be run from the repository root, not from inside the tests/ subdirectory. Since this README lives in tests/, a reader might naturally try running the commands from there and get confusing errors. Adding a brief note clarifying the working directory would improve usability.

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[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.

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