🚦 Improve Workflow Polling and Signal Handling

[dsyme]

Summary

• Refactored workflow completion waiting mechanism with signal-aware polling
• Added robust error handling and timeout support for workflow checks
• Introduced a generic signal-aware polling utility for better interrupt handling

Key Changes

• Created signal_aware_poll.go with a flexible PollWithSignalHandling function
• Reimplemented WaitForWorkflowCompletion using the new polling mechanism
• Added comprehensive test coverage for the new polling utility
• Enhanced error handling for repository creation and workflow monitoring

Improvements

• Supports graceful Ctrl-C interruption during long-running operations
• Provides configurable polling intervals and timeouts
• Improves visibility with optional verbose logging

[Copilot]

Pull Request Overview

This PR refactors the workflow polling mechanism to use a reusable signal-aware polling utility. The changes introduce PollWithSignalHandling, a generic function that handles timeouts and graceful Ctrl-C interruption for long-running operations.

Key changes:

• Created a new signal_aware_poll.go module with a flexible polling utility
• Refactored WaitForWorkflowCompletion to use the new polling mechanism instead of custom polling logic
• Added error handling for repository creation race conditions in trial command

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
pkg/cli/signal_aware_poll.go	New polling utility with signal handling, timeout support, and configurable callbacks
pkg/cli/signal_aware_poll_test.go	Comprehensive test coverage for the new polling utility including success, failure, timeout, and signal interruption cases
pkg/cli/pr_automerge.go	Refactored to use PollWithSignalHandling instead of custom polling loop
pkg/cli/pr_automerge_test.go	Added test to verify signal-aware polling integration
pkg/cli/trial_command.go	Added fallback error handling for "name already exists" race condition during repository creation

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