Run captain agent tests with agent builder

[kumaranvpl]

Why are these changes needed?

Related issue number

Closes #1302

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.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ There is a different number of reports uploaded between BASE (12e510e) and HEAD (134e10d). Click for more details.

HEAD has 2403 uploads less than BASE

Flag	BASE (12e510e)	HEAD (134e10d)
core-without-llm	28	1
3.9	156	0
ubuntu-latest	259	4
3.10	187	0
commsagent-discord	18	0
optional-deps	281	0
3.13	169	1
macos-latest	206	0
3.11	110	3
browser-use	10	0
3.12	71	0
windows-latest	228	0
commsagent-slack	18	0
commsagent-telegram	18	0
graph-rag-falkor-db	12	0
crawl4ai	22	0
docs	12	0
interop	22	0
interop-crewai	18	0
interop-langchain	18	0
interop-pydantic-ai	18	0
jupyter-executor	18	0
twilio	18	0
websockets	18	0
retrievechat-pgvector	20	0
retrievechat-mongodb	20	0
retrievechat	29	0
retrievechat-qdrant	28	0
agent-eval	2	0
teachable	7	1
gpt-assistant-agent	6	0
lmm	7	1
gemini	29	0
websurfer	30	0
retrievechat-couchbase	6	0
anthropic	30	0
cerebras	28	0
llama-index-agent	6	0
cohere	27	0
groq	28	0
mistral	28	0
ollama	29	0
together	28	0
bedrock	29	0
swarm	28	0
long-context	5	0
integration	12	0
core-llm	9	0
openai-realtime	1	0
falkordb	2	0
gemini-realtime	1	0
neo4j	2	0
deepseek	1	0
openai	1	0

see 64 files with indirect coverage changes

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