wren-langchain: session properties are not forwarded, same gap as #2638

[AmirF194]

wren-langchain: session properties are not forwarded, same gap as #2638

Summary

WrenToolkit.query() / dry_plan() / dry_run() in sdk/wren-langchain never
accept or forward session properties to the engine. wren.engine.WrenEngine
already threads properties through its whole planning path, so any project
with row-level access control (RLAC) enabled cannot be queried through this
SDK at all: planning fails with a missing-session-property error, and there
is no parameter to supply one.

This is the same defect reported in #2638 for wren-pydantic; the two
toolkits share the same method signatures and the gap is identical in both.

Root cause

• core/wren/src/wren/engine.py
  • dry_plan(self, sql, properties=None)
  • query(self, sql, limit=None, properties=None) calls self.dry_plan(sql, properties)
  • dry_run(self, sql, properties=None) same shape
• sdk/wren-langchain/src/wren_langchain/_toolkit.py
  • query(self, sql, limit=None) calls engine.query(sql, limit=limit), no properties
  • dry_plan(self, sql) calls engine.dry_plan(sql), same gap
  • dry_run(self, sql) same

Repro

toolkit = WrenToolkit.from_project("./my_project")
toolkit.query("SELECT * FROM orders")   # no `properties` kwarg available

With an RLAC rule requiring session_user_id, this always fails with a
missing-session-property planning error, and there is no way to pass one
through the toolkit.

Fix

Opening a PR now that adds the properties kwarg to all three methods and
forwards it to the engine, mirroring the fix shape already proposed for
wren-pydantic in #2684.