fix: correct assign-to-agent GraphQL mutations per official docs

[Copilot]

Copilot fails to start on assigned issues because the assign_agent_helpers.cjs GraphQL queries diverged from the official API spec.

Bugs fixed

• capabilities list notation — suggestedActors was passed capabilities: CAN_BE_ASSIGNED (scalar) in both getAvailableAgentLogins and findAgent; the field is a list type and requires capabilities: [CAN_BE_ASSIGNED]

• Fallback mutation missing agentAssignment — when replaceActorsForAssignable is forbidden and the code falls back to addAssigneesToAssignable, the agentAssignment block was omitted entirely. Without it Copilot is added as an assignee but receives no task context, producing the "unable to start working" error. The fallback now conditionally builds agentAssignment identically to the primary mutation using the parameters already in scope.

# Before (fallback)
addAssigneesToAssignable(input: { assignableId: $assignableId, assigneeIds: $assigneeIds })

# After (fallback) — mirrors primary mutation
addAssigneesToAssignable(input: {
  assignableId: $assignableId,
  assigneeIds: $assigneeIds,
  agentAssignment: { targetRepositoryId: $targetRepoId, baseRef: $baseRef, model: $model, ... }
})

Test fixes

11 test mocks were returning { addAssigneesToAssignable: ... } as the primary mutation response. Since the primary mutation is replaceActorsForAssignable, response?.replaceActorsForAssignable?.__typename silently returned undefined — the success path was never exercised. Updated to { replaceActorsForAssignable: { __typename: "ReplaceActorsForAssignablePayload" } }.

[Copilot]

Pull request overview

This pull request fixes GitHub Copilot “assign to agent” GraphQL usage in the setup action so assignments succeed against the official API schema and so the fallback mutation supplies agentAssignment context needed for the agent to start.

Changes:

• Fix suggestedActors GraphQL argument type by passing capabilities: [CAN_BE_ASSIGNED] (list) instead of a scalar.
• Update the forbidden/permission fallback path (addAssigneesToAssignable) to optionally include an agentAssignment block mirroring the primary mutation’s parameters.
• Correct test mocks so the success path is exercised by returning replaceActorsForAssignable.__typename.

Show a summary per file

File	Description
actions/setup/js/assign_to_agent.test.cjs	Updates GraphQL mock responses to match the primary replaceActorsForAssignable mutation shape.
actions/setup/js/assign_agent_helpers.cjs	Aligns GraphQL queries/mutations with the documented schema; adds agentAssignment to the fallback mutation when applicable.
actions/setup-cli/install.sh	Updates a header comment (but currently makes it self-referential; see review comment).

Copilot's findings

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• Files reviewed: 3/3 changed files
• Comments generated: 1

[pelikhan]

@copilot merge main and recompile

[Copilot]

@copilot merge main and recompile

Done — merged main and recompiled. Resolved a single conflict in actions/setup-cli/install.sh (the sync comment now correctly points to install-gh-aw.sh as the source file). No workflow lock files changed.