Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@packages/app/src/components/titlebar-tauri-compat.test.ts`:
- Around line 3-4: The test reads files into titlebarSource and baseCssSource
using Bun.file(...).text() with a hardcoded relative path
"../../../ui/src/styles/base.css"; update the test to document the expected
monorepo layout (add a brief comment near baseCssSource) and wrap the
Bun.file(...) call for baseCssSource in a defensive check/try-catch that
verifies existence or catches the file-not-found error and throws a clear,
descriptive message indicating the expected path and how to adjust it; keep the
titlebarSource read unchanged but ensure both reads use the same defensive
pattern around Bun.file(...).text() so CI failures show a clear diagnostic
instead of a raw file-not-found.

In `@packages/desktop-electron/src/main/tauri-cleanup.test.ts`:
- Around line 18-19: The test contains two assertions using
expect(readme).not.toMatch(...); remove the redundant, more specific assertion
expect(readme).not.toMatch(/packages\/desktop\s+tauri/) and keep the general
case expect(readme).not.toMatch(/tauri/i) so failures are clearer and not
duplicated; update the test in tauri-cleanup.test.ts by deleting the expect with
/packages\/desktop\s+tauri/.

In `@packages/opencode/test/server/cors-middleware.test.ts`:
- Around line 7-34: Replace raw bun:test "test" usages with the repository's
testEffect harness: import and call testEffect to get "it", then convert the two
tests ("allows localhost browser origins" and "does not allow legacy Tauri
origins") to use it.live or it.effect as appropriate and wrap their bodies in
Effect.gen(function* () { ... }); inside each generator yield the
Server.Default() service to obtain app (referencing Server.Default().app) and
perform the same app.request("/global/health", { headers: { Origin: ... } })
checks; keep the same assertions on response.status and
response.headers.get("access-control-allow-origin") but run them inside the
Effect.gen context so tests use the shared effect runtime and service injection
pattern.

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@packages/opencode/test/server/cors-middleware.test.ts`:
- Around line 15-23: The test unnecessarily wraps an existing promise with
Promise.resolve inside Effect.promise; update the calls that use
Effect.promise(() => Promise.resolve(app.request(...))) to instead call
Effect.promise(() => app.request(...)) (remove the Promise.resolve wrapper) for
the instances that call app.request with Origin header (both occurrences around
the app.request("/global/health", ...) and the other similar call), ensuring you
only remove the redundant wrapper and leave the Effect.promise and app.request
usage and headers intact.