ci: merge backend-e2e workflow into tests workflow

[Copilot]

backend-e2e.yml was a separate workflow that duplicated the full dependency build (checkout, toolchain, system deps, protoc, cargo registry cache) already performed by tests.yml, causing a complete rebuild for E2E tests.

Changes

• Deleted .github/workflows/backend-e2e.yml
• tests.yml: Added tests/backend-e2e/** to path triggers; appended a "Run backend E2E tests" step at the end of the existing test job

- name: Run backend E2E tests
  if: ${{ secrets.E2E_WALLET_MNEMONIC != '' }}
  run: cargo test --test backend-e2e --all-features -- --ignored --nocapture --test-threads=1
  env:
    E2E_WALLET_MNEMONIC: ${{ secrets.E2E_WALLET_MNEMONIC }}

Because the E2E step runs in the same job, it reuses the already-compiled target/ artifacts from the preceding cargo test step — no rebuild. The step is a no-op when E2E_WALLET_MNEMONIC is not set.

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[lklimek]

@claude we need to add another step that will run cleanup_test_wallets(). Do required changes in the rust code. I guess it will be enough to add some noop test and run only this one test, as the test setup should do the cleanup as first step, but check this.

[claude]

Claude finished @lklimek's task in 10m 21s —— View job

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Completed: added cleanup_only noop test

• Understand backend-e2e test structure and cleanup_test_wallets()
• Create a noop cleanup test
• Note CI workflow step (can't modify workflow files)
• Commit and push changes

What was done

Confirmed that cleanup_test_wallets() runs during BackendTestContext::init() (harness.rs:239) as the final initialization step. Since tests use tokio::sync::OnceCell, a separate cargo test invocation creates a fresh process where ctx().await triggers initialization including the cleanup sweep.

Created tests/backend-e2e/cleanup_only.rs — a noop test that just calls ctx().await, triggering the full init sequence which sweeps orphaned test wallet funds back to the framework wallet.

Run with:

cargo test --test backend-e2e --all-features -- --ignored --nocapture cleanup_only

CI workflow step (manual action needed)

I cannot modify .github/workflows/ files due to permissions. Please add this step to tests.yml after the existing "Run backend E2E tests" step:

- name: Cleanup E2E test wallets
  if: always() && secrets.E2E_WALLET_MNEMONIC != ''
  run: cargo test --test backend-e2e --all-features -- --ignored --nocapture cleanup_only
  env:
    E2E_WALLET_MNEMONIC: ${{ secrets.E2E_WALLET_MNEMONIC }}

Note the if: always() condition — this ensures cleanup runs even if the E2E tests fail (e.g., a test panicked mid-execution leaving orphaned wallets with funds).
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