Fix CI: cargo test --all ignored default-members, broke on ndi-io

cargo test --all is a synonym for --workspace, which explicitly
overrides [workspace] default-members and tries to build every
workspace member — including ndi-io and omt-io, which need real SDKs
(NDI SDK, libomt) that aren't installed on the GitHub Actions runner.
This built fine locally (the NDI SDK genuinely is installed on this
dev machine) but failed in CI, which is exactly the scenario
default-members exists to prevent. Dropped --all so CI's `cargo test`
matches the local default-members-respecting command this was already
verified against.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Author: allan sargeant

.github/workflows/ci.yml

@@ -23,4 +23,8 @@ jobs:
       - name: clippy
         run: cargo clippy --all-targets -- -D warnings
       - name: test
-        run: cargo test --all
+        # No --all/--workspace: that overrides [workspace] default-members
+        # and would try to build ndi-io/omt-io too, which need real SDKs
+        # (NDI SDK, libomt) that aren't installed on this runner. Plain
+        # `cargo test` respects default-members and stays SRT-only.
+        run: cargo test