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FIX: Review the eight F841 unused-local findings in numerical modules #883
Description
Problem
flake8 reports eight F841 unused-local findings across four numerical modules. Kept separate from the mechanical hygiene sweep deliberately: in numerical code an assigned-and-discarded matrix is occasionally the residue of an incomplete edit, so each site needs a human decision rather than a blanket deletion.
| Location | Finding |
|---|---|
_robustlq.py:245 |
Q, R unpacked from instance state, never used |
_robustlq.py:246 |
beta assigned, never used |
_robustlq.py:384 |
Q, R unpacked, never used |
_kalman.py:161 |
k assigned, never used |
_lss.py:394 |
H assigned, never used |
_matrix_eqn.py:275 |
k assigned, never used |
The _robustlq.py cluster is the one to examine first: three separate sites unpack Q, R and beta and then never use them — the pattern you would expect if a computation was refactored and its inputs left behind.
Acceptance criteria
- Each site is either removed, or kept with a comment explaining why the binding exists
- Any site where the unused variable reveals a genuine logic gap gets its own issue
- Suite passes with no new warnings
From the July 2026 technical-debt audit (AI-assisted; claims verified against 28d4b3b on 2026-07-25).
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