Three defects that compounded into a test suite nobody could run and nobody
was running.
The suite has been red on main since 2026-07-20. `connect_frame_matches_gateway_schema`
asserts a TLS-pinned connection advertises no capabilities, but #111933 wrote
that assertion while caps held only inline-widgets, and #111920 made
`agent-kind` unconditional the same day. No textual conflict, so both landed
and the assertion has been wrong ever since. Pinning only withdraws inline
widgets, so assert exactly that.
`cargo test` could not run on macOS at all: tauri-plugin-notifications links a
Swift static library, nothing adds an rpath for the Swift runtime, and every
test binary aborted at load with `Library not loaded:
@rpath/libswift_Concurrency.dylib`. Emit the rpath from build.rs.
Neither surfaced because linux-app.yml never ran `cargo test` - it only checked
formatting and built bundles. Run the suite on Linux, and upgrade the macOS job
from `check` to `test` so link-time breakage like the rpath is caught at all;
`check` never links, so it cannot see this class of failure.
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