Fix duplicate validateEngineStub declaration breaking linter and tests

[Copilot]

Duplicate validateEngineStub function in pkg/cli/add_command_test.go and pkg/cli/flags_test.go caused compilation failure, breaking both linter and security test runs.

Changes

• Removed duplicate declaration from flags_test.go, keeping single definition in add_command_test.go
• Fixed testifylint violations across 4 test files: changed assert.Error/NoError to require.Error/NoError for error assertions (9 instances)

// Before (testifylint violation)
assert.Error(t, err, "Should error")
assert.NoError(t, err, "Should not error")

// After (correct usage)
require.Error(t, err, "Should error")
require.NoError(t, err, "Should not error")

Files modified: flags_test.go, actions_build_command_test.go, add_command_test.go, generate_action_metadata_command_test.go, logs_command_test.go

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/user
  • Triggering command: /usr/bin/gh gh api user --jq .login g_.a 9615979/b304/vet.cfg /bin/sh -p workflow_test -lang=go1.18 /bin/sh -c -node.git -goversion /usr/bin/git -c=4 -nolocalimports -importcfg ortcfg (http block)
  • Triggering command: /usr/bin/gh gh api user --jq .login oad-artifact.git -trimpath /usr/bin/git -p github.com/githuapi l/linux_amd64/couser git rev-�� k/gh-aw/gh-aw/.github/workflows l/linux_amd64/compile (http block)
  • Triggering command: /usr/bin/gh gh api user --jq .login f/tags/v6 go /usr/bin/git -json GO111MODULE ux-amd64/pkg/toolist git conf�� k/gh-aw/gh-aw/.github/workflows remote.origin.url (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

Reference: https://github.com/githubnext/gh-aw/actions/runs/20647831216/job/59287810762

Lint go
Review security tests

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