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fix #385 wh()/pa() no longer crashes on nested PseudoPositioner aux (#389)

* fix #385 wh()/pa() no longer crashes on nested PseudoPositioner aux

Make the formatter tolerant of structured auxiliary positions instead
of filtering specific component classes:

- roundoff() handles namedtuple/Mapping (-> dict), Sequence excl.
  str/bytes (-> list), opaque values (-> repr); never raises.
  Scalar contract unchanged.
- wh()'s labeled_value renders dict results as name={k=v, ...} and
  list results as name=[v1, ...]; scalar formatting unchanged.
- auxiliary_axis_names docstring clarifies that nested PseudoPositioner
  sub-devices are included and rendered inline by wh().
- Add regression tests (test_roundoff_structured, test_wh_nested_-
  pseudopositioner_issue_385) using the mandatory parms/context style.
- Discovered separately: structured auxiliary components do not
  round-trip through export/restore (only names are saved).  Tracked
  as #388; out of scope for #385.

Agent: OpenCode (claudeopus47)

* test #385 cover list-shaped auxiliary in wh()

CI reported diffract.py:913-914 (the ``isinstance(rounded, list)``
branch in ``wh()``'s ``labeled_value``) as uncovered.  Add a fourth
parametrized case using a ``_ListPositionPositioner`` whose
``.position`` is a list, so ``roundoff()`` returns a list and the
list branch executes.

Agent: OpenCode (claudeopus47)

23 of 23 new or added lines in 2 files covered. (100.0%)

3355 of 3355 relevant lines covered (100.0%)

4.99 hits per line