chore: move test files from tests/unit/tools to src/tools

[devin-ai-integration]

Move test files from tests/unit/tools to src/tools

This PR moves the test files from packages/shortest/tests/unit/tools to packages/shortest/src/tools, keeping the files as-is and only updating import paths where needed.

Link to Devin run: https://app.devin.ai/sessions/8684e536b00049f2a8ac26e13e156bee
Requested by: Razvan Marescu (razvan@marescu.net)

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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/tools* to packages/shortest/src/tools/*
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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