bug fix for max_consecutive_auto_reply

[marufaytekin]

Why are these changes needed?

Related issue number

Closes #600

Checks

• I've included any doc changes needed for https://docs.ag2.ai/. See https://docs.ag2.ai/docs/contributor-guide/documentation to build and test documentation locally.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.

[davorrunje]

@marufaytekin can you please add a test for this?

[marklysze]

Thanks @marufaytekin!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ There is a different number of reports uploaded between BASE (e627c1c) and HEAD (cef9b5a). Click for more details.

HEAD has 1126 uploads less than BASE

Flag	BASE (e627c1c)	HEAD (cef9b5a)
3.9	73	0
ubuntu-latest	113	1
optional-deps	141	0
commsagent-telegram	9	0
3.10	92	0
commsagent-discord	9	0
3.13	83	0
core-without-llm	14	1
browser-use	3	0
3.11	44	1
macos-latest	102	0
3.12	33	0
commsagent-slack	9	0
windows-latest	110	0
retrievechat-pgvector	9	0
jupyter-executor	9	0
twilio	9	0
retrievechat-mongodb	9	0
interop	9	0
retrievechat-qdrant	13	0
retrievechat	14	0
graph-rag-falkor-db	6	0
crawl4ai	9	0
websockets	9	0
docs	6	0
interop-langchain	9	0
interop-crewai	9	0
interop-pydantic-ai	9	0
gpt-assistant-agent	3	0
cohere	11	0
agent-eval	1	0
lmm	3	0
websurfer	14	0
gemini	14	0
long-context	3	0
swarm	12	0
teachable	3	0
retrievechat-couchbase	2	0
llama-index-agent	3	0
together	14	0
groq	14	0
ollama	14	0
bedrock	12	0
anthropic	14	0
cerebras	14	0
mistral	14	0

Files with missing lines	Coverage Δ
autogen/agentchat/conversable_agent.py	66.44% <100.00%> (-1.79%)	⬇️

... and 46 files with indirect coverage changes

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