* fix: DevUI list[Message] entry for declarative ToolAgent (#6533)
When a declarative ToolAgent is created with default settings the
entry JoinExecutor declares `input_types = [dict | str | list[Message]
| ActionTrigger | ...]`. DevUI called `select_primary_input_type`
which returned bare `Message` instead of `list[Message]`, then passed
a single Message to the executor that expects a list — causing a
"cannot handle message of type Message" runtime error.
Changes:
- Add `_is_list_message_type` helper (GenericAlias cannot be used with
isinstance; get_origin/get_args required).
- Add `_find_chat_message_type` that recursively searches union members
and returns `list[Message]` in preference to bare `Message`.
- `select_primary_input_type`: first-pass uses `_find_chat_message_type`
so the declarative entry type is correctly returned as `list[Message]`.
- `generate_input_schema`: returns `{"type":"string"}` for `list[Message]`
so DevUI renders a plain text box.
- Add `_looks_like_message_dict` heuristic (role present, type=="message",
or exactly {"input":...}) to distinguish serialised Message payloads
from structured workflow inputs without false positives.
- `parse_input_for_type`: handle `list[Message]` target — wrap plain
strings/Message objects, convert lists of dicts item-by-item, pass
structured workflow inputs through unchanged.
- Add 12 regression tests (57 total pass).
* fix: resolve pyright unknown-type errors in parse_input_for_type
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Co-authored-by: Eduard van Valkenburg <eavanvalkenburg@users.noreply.github.com>
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