docs(flomni): document manual tomo_alignment_fit offset nudge

Add a snippet to the XrayEye alignment section showing how to patch the
constant x/y offset terms of tomo_alignment_fit directly on the command
line, for a quick few-micron correction (e.g. after moving foptz) without
recording a new fit.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FFeiCHv3qUxxssmP9Qzhom

docs/user/ptychography/flomni.md

@@ -272,6 +272,22 @@ The loading routine uses default values for the vertical alignment. This behavio
 At each projection, the angular dependent is computed by  
 `flomni.get_alignment_offset(angle)`, with _angle_ in degrees.
 
+To manually nudge the alignment by a few microns without recording a new fit
+(e.g. to compensate for a small shift introduced by moving `foptz`), edit the
+constant offset term of the currently loaded fit directly:
+```python
+fit = flomni.client.get_global_var("tomo_alignment_fit")
+fit[0][2] += 5.0   # x offset, microns
+fit[1][2] += 3.0   # y offset, microns
+flomni.client.set_global_var("tomo_alignment_fit", fit)
+```
+`tomo_alignment_fit` is a 2x5 list (row 0 = x, row 1 = y); column 2 in each
+row is the constant offset of the sinusoidal fit
+(`correction = A*sin(angle + phase) + offset [+ 3rd-order term for y]`), so
+changing it shifts the correction by that amount at every angle without
+touching the fitted amplitude/phase. Check the result with
+`flomni.get_alignment_offset(angle)`.
+
 The alignment can be cleared by  
 `flomni.reset_tomo_alignment_fit()`