…Pattern example (#79 panel round-2)

Panel BLOCK round-2, addressed:
- missing-test (ag3): the 'FK not among plain inputs' test only checked for the warning text; it
  would still pass if companyId stayed in the plain-input list. Now asserts the EXACT plain-field
  bullet phrasing for companyId is ABSENT (it lives only in the <select> Relationship-selectors
  section) — so the double-listing regression that caused the park is protected.
- minor: the Pattern example used entity.fields[0], which could be a parent FK (contradicting the
  <select> mandate). Now derives exampleField = first NON-relationship field, and notes a parent FK
  is a <select> instead.
- minor: 'Where to add them' no longer says '…to each input'; it now says each field's control is an
  <input> for plain fields, a native <select> for a parent FK.

24 testid-contract tests; full core suite 3033 pass, 0 fail.

…fix (#79 panel round-3)

Panel round-2 correctly flagged that the exampleField fix was not MEANINGFULLY tested: the Contact
fixture's fields[0] is 'name' (already non-FK), so old (fields[0]) and new (find non-FK) code agree —
a regression would pass. Plus the fallback rendered an FK as <input> when every field is an FK.

- Code: when there is NO plain (non-FK) field, the Pattern example now shows the FK as a native
  <select> (never an <input>); the empty-fields case shows a generic <input> note with no invented
  field name.
- Tests: two new fixtures — fkFirstEntity (first field IS the FK 'userId', with a non-FK 'role') and
  allFkEntity (only field is the FK). Assert: FK-first → example names the non-FK 'role' as <input>
  and NEVER the FK as <input>; all-FK → example shows <select> for the FK, never <input>.

26 testid-contract tests; full core suite 3035 pass, 0 fail.

…ield (#79 residuals)

Panel round-3 PASSED but noted ag1 residuals in the row-cell Pattern example; closed them:
- rowExampleLine is now emitted ONLY when entity.shows has a real column (rowCell testids exist for
  entity.shows only), so it never invents 'name' and never references a rowCell testid absent from
  the Complete contract (the all-FK / empty-fields cases previously did both).
- Tests: all-FK entity asserts NO row-cell example + no rowCell(userId); new empty-fields fixture
  asserts no invented field, no record.name, no row-cell example — falls to the generic form note.

27 testid-contract tests; full core suite green.