Further PSyclone pass

### Are there any linked Issues or Pull Requests?

_No response_

### Brief description

Some scripts have been altered or tied in the pass to fix some PSyclone changes.

However as such, some files that did have scripts, no longer do.

Have another exploration of coverage

Expectation of smaller simpler ticket, then more complex ticket

Smaller, potentially more easily available scripts:
tr_mix
bl_lsp
btq_int
bdy_impl3
bl_diags_mod
buoy_tq

Harder scripts:
bdy_expl2
ex_coef
excf_nl_9c
kmkhz_9c

### Further details of the issue.

_No response_

Start by examining the smaller scripts named in the issue—tr_mix, bl_lsp, btq_int, bdy_impl3, bl_diags_mod, and buoy_tq—and compare their current contents with the expected PSyclone coverage. Check the harder scripts only after establishing the smaller scope; done means identifying which scripts have lost coverage and completing the agreed smaller pass before expanding the work.

Written by the indexing model from the issue text.