Fix Raster.__rtruediv__ computing operands in wrong order

[Copilot]

• Fix Raster.__rtruediv__ to compute other / self.arr instead of self / other
• Add isinstance(other, float | int) check and return NotImplemented fallback to match __truediv__ type handling
• Remove unnecessary Raster branch from __rtruediv__ (handled by __truediv__)
• Refactor __rtruediv__ to use early-exit guard to reduce indentation
• Change early-exit guard to return NotImplemented instead of raise NotImplementedError
• Fix the existing test_right_div_float test to assert the correct values for 2.0 / raster

Original prompt

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This section details on the original issue you should resolve

<issue_title>Raster.__rtruediv__ flips the division operation around the wrong way</issue_title>
<issue_description></issue_description>

<agent_instructions>Fix this issue and write tests</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Raster.__rtruediv__ flips the division operation around the wrong way #424

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[t-t-sonarqube]

Quality Gate passed

Issues

• 0 New Issues
• 0 Fixed Issues
• 0 Accepted Issues

Measures

• 0 Security Hotspots
• 80.00% Coverage (95.00% Estimated after merge)
• 0.00% Duplicated Code (0.00% Estimated after merge)

Project ID: tonkintaylor_rastr_c6820163-843b-45ef-9d15-db4bc95045e9

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