maintenance: manager refactoring, testing

[tschaefer]

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[gitguardian]

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GitGuardian id	GitGuardian status	Secret	Commit	Filename
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[Copilot]

Pull request overview

This PR refactors the manager component to use context-based cancellation instead of internal signal handling, improving testability and separation of concerns. Signal handling is moved up to the command layer where it belongs.

• Manager.Run() now accepts a context parameter for cancellation control
• Signal handling logic moved from manager package to cmd/run package
• Comprehensive test suite added for manager package covering success and error cases

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
internal/manager/manager.go	Refactored Run() method to accept context parameter and removed signal handling logic
cmd/run/run.go	Added signal.NotifyContext to handle SIGINT/SIGTERM and pass context to manager
internal/manager/manager_test.go	Added comprehensive test coverage for manager initialization and Run() method

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