fix: ReActReasoning.__repr__ AttributeError and STLTMemory Mesa 4.x model.steps compatibility

[abhinavk0220]

Fixes #205

Fixes #204

Summary

Two small but real bugs fixed in this PR:

1. ReActReasoning.__repr__() crashes with AttributeError
2. STLTMemory uses model.steps which does not exist in Mesa 4.x

---

Bug 1 — ReActReasoning.__repr__() AttributeError

ReActReasoning.__repr__() was referencing self.remaining_tool_calls
which does not exist on ReActReasoning. That attribute belongs to
ReWOOReasoning only. Calling repr() on any ReActReasoning instance
would crash with:

AttributeError: 'ReActReasoning' object has no attribute 'remaining_tool_calls'

Fix: Removed remaining_tool_calls from ReActReasoning.__repr__().
ReWOOReasoning.__repr__() correctly keeps it since that class does have
the attribute.

---

Bug 2 — STLTMemory uses model.steps (Mesa 4.x incompatibility)

st_lt_memory.py was using self.agent.model.steps to record the current
step when consolidating memory entries. model.steps does not exist in
Mesa 4.x — it was removed. This causes AttributeError during any
simulation run that triggers memory consolidation.

# Before — crashes in Mesa 4.x
step=self.agent.model.steps,

# After — correct Mesa 4.x API
step=int(getattr(self.agent.model, "_time", 0)),

The same fix was already applied to record_model.py — this brings
st_lt_memory.py in line with the same pattern.

---

Testing

All existing tests pass:

python -m pytest tests/ -q --ignore=tests/test_parallel_stepping.py
# 0 failures

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