FBP Go: Calculating Fire Size

**Actual Behaviour**

B1E reporting: Calculating Fire Size

**Steps To Reproduce**

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**Screenshots**

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**Expected Behaviour**

A clear and concise description of what you expected to happen.

Start by locating the FBP Go fire-size calculation and the B1E reporting path in the Python project. The issue does not provide usable reproduction steps or an expected result, so first confirm the failing scenario and the intended fire-size output before assessing what is done.

Written by the indexing model from the issue text.