The code node's Input files and the agent node's Documents now render the same
NodeDocumentsControl: an All/None/Choose toggle, a multiselect of upstream
document/artifact refs, and a free-text add-ref escape (a typed A1/id appears as
a removable chip). The control owns its toggle state so Choose is reachable from
an empty selection — retiring the per-node parent flag. File passing stays
agent-only; the code node keeps its inputs field name and stages the selected
refs as files in the sandbox.
An input_documents entry with no matching upstream option (a renamed or deleted
upstream output variable, or a literal ref) now appears as a removable chip in
the agent node's Choose-mode document selector instead of silently vanishing,
so the stored selection stays visible and editable.
Adds withChosenDocumentOptions to merge stored selections into the multiselect
options, with tests.
The agent-node panel gains a Documents section (All input docs / None / Choose
upstream document variables) and a file-passing selector (auto / native /
extract), writing the input_documents and file_passing config the engine
consumes. Selections persist as bare state-variable names so they resolve
against run state; the toggle, chosen docs, and file-passing mode re-derive from
the stored config on reload. Reuses the existing multiselect, select, and
upstream-variable enumeration.
Known minor: an input_documents entry whose upstream variable was renamed or
deleted is preserved in config but not shown as a removable chip in Choose mode.
Alex