Fix unused variables, imports, and exception handling from PR review

[Copilot]

Description

Addresses code review feedback from PR #14 by removing dead code and improving exception handling in the workspace analyzer module.

Changes:

• Unused variables removed: max_bounds, volume, batch_size, success_rates_np
• Unused imports cleaned up: Tuple, Enum, o3d, plt, Axes3D, VisualizationType, Path, DiskCache, Optional, product, field, TYPE_CHECKING, Callable across 10 files
• Exception handling improved: Replaced bare except: with specific types (OSError, np.linalg.LinAlgError, psutil.Error) and added explanatory comments for empty except clauses
• Unreachable code removed: Cleaned up dead code in _load_from_cache and _save_to_cache methods

Type of change

• Bug fix (non-breaking change which fixes an issue)

Screenshots

N/A - code cleanup only

Checklist

• I have run the black . command to format the code base.
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• Dependencies have been updated, if applicable.

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