fix(assign_to_agent): allow multiple assignments to same issue when pull_request_repo differs

[Copilot]

When assign_to_agent is called twice for the same issue with different pull_request_repo values (e.g. iOS and Android targets), the second call was silently skipped — the already-assigned guard checked only agentId, ignoring the target repo.

Changes

• assign_to_agent.cjs: Treat (agent, pull_request_repo) as the uniqueness key. The guard now short-circuits only when no pull_request_repo is specified:

// Before — skips any re-assignment regardless of target repo
if (currentAssignees.some(a => a.id === agentId)) { ... continue; }

// After — only skips when no explicit pull_request_repo is provided
if (currentAssignees.some(a => a.id === agentId) && !effectivePullRequestRepoId) { ... continue; }

• assign_to_agent.test.cjs: Adds a test asserting that when an agent is already assigned but a different pull_request_repo is supplied, the assignment proceeds and the mutation is called with the correct targetRepoId.

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[Copilot]

Pull request overview

Fixes assign_to_agent so a second assignment for the same issue is not skipped when it specifies a different pull_request_repo (e.g., separate Android/iOS target repos).

Changes:

• Updates the “already assigned” guard to only short-circuit when no effective PR target repo is configured.
• Adds a unit test ensuring assignment proceeds (and includes targetRepoId) when the agent is already assigned but a pull_request_repo is provided.

Show a summary per file

File	Description
actions/setup/js/assign_to_agent.cjs	Adjusts the already-assigned guard to allow reassignment when a PR target repo is configured.
actions/setup/js/assign_to_agent.test.cjs	Adds coverage for assigning with pull_request_repo when the agent is already an assignee.

Copilot's findings

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• Files reviewed: 2/2 changed files
• Comments generated: 1

[Copilot]

The updated guard disables the “already assigned” short-circuit whenever effectivePullRequestRepoId is set, but it doesn’t actually enforce uniqueness on (agent, pull_request_repo). As a result, if the same issue appears multiple times with the same pull_request_repo in a single run, this will re-run the mutation each time and can trigger duplicate agent runs/PR attempts. Consider tracking attempted assignments in-memory using a key like (assignableId, agentId, effectivePullRequestRepoId || "") and skipping when the same key is seen again, while still allowing a different pull_request_repo to proceed.