chore: move test files from tests/unit/core/runner to src/core/runner

[devin-ai-integration]

Moved the test files from packages/shortest/tests/unit/core/runner/* to packages/shortest/src/core/runner/* without making functional changes, only updating import paths where needed. No other functional changes were made.

Link to Devin run: https://app.devin.ai/sessions/9dd30b0acead40cd8147301ecfc3d53a
Requested by: Razvan Marescu

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Name	Status	Preview	Comments	Updated (UTC)
shortest	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 1, 2025 3:14am

[devin-ai-integration]

Original prompt from Razvan:

Received message in Slack channel #shortest:

@Devin for antiwork/shortest, move the test files from packages/shortest/tests/unit/core/runner* to packages/shortest/src/core/runner/*
Basically, the test files should be moved along with the files they are testing.

* Do not make any functional changes, move the files as-is
* Update import paths IF needed

[devin-ai-integration]

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