fix: preserve TextMentionTermination sources in config

[maxpetrusenkoagent]

Summary

• Preserve TextMentionTermination sources when dumping/loading component configs.
• Keep old configs compatible by making sources optional and omitted when unset.
• Add a regression test covering source-filtered termination after component round-trip.

Why

Issue #7487 asks for a mission-keeper style goal-integrity node. A practical building block already exists: a read-only integrity agent can emit a drift marker, and TextMentionTermination can restrict that marker to the mission keeper source.

Before this fix, saving/loading the termination condition dropped sources, so any participant could trigger the marker after config round-trip.

Addresses #7487.

Verification

• RED: .venv-agentchat/bin/python -m pytest packages/autogen-agentchat/tests/test_termination_condition.py::test_text_mention_termination_serializes_sources -q failed because config.config.get("sources") was None.
• GREEN: .venv-agentchat/bin/python -m pytest packages/autogen-agentchat/tests/test_termination_condition.py::test_text_mention_termination_serializes_sources -q passed.
• .venv-agentchat/bin/python -m pytest packages/autogen-agentchat/tests/test_termination_condition.py -q passed, 14 tests.
• .venv-agentchat/bin/python -m ruff check packages/autogen-agentchat/src/autogen_agentchat/conditions/_terminations.py packages/autogen-agentchat/tests/test_termination_condition.py passed.
• .venv-agentchat/bin/python -m ruff format --check packages/autogen-agentchat/src/autogen_agentchat/conditions/_terminations.py packages/autogen-agentchat/tests/test_termination_condition.py passed.
• .venv-agentchat/bin/pyright --pythonpath .venv-agentchat/bin/python packages/autogen-agentchat/src/autogen_agentchat/conditions/_terminations.py packages/autogen-agentchat/tests/test_termination_condition.py passed.
• .venv-agentchat/bin/python -m build --wheel packages/autogen-agentchat passed.
• Hermes autoreview of exact diff: CLEAN.

Note: local disk was too constrained for a full workspace uv run sync; verification used a minimal package-scoped venv with autogen-core and autogen-agentchat installed editable.

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[maxpetrusenkoagent]

Review-Fix Sweep — No Actionable Blockers

Hermes agent ran an automated review-fix lane on this PR.

Verifier state:

• : QUEUED (CLA bot — not actionable by code change)
• : ✅ PASS
• : REVIEW_REQUIRED (no code review comments found)

Code diff review:

• 2 files changed: (+7/-3) and (+13/-0)
• Fix is minimal and correct: field now preserved through config roundtrip
• Test covers the serialization roundtrip with a real → cycle
• Local syntax checks: ✅ PASS on both changed files

Conclusion: No code-level blockers found. The PR is ready for maintainer review pending CLA signing.

[maxpetrusenkoagent]

Review-fix sweep: no actionable blockers

I fetched the latest PR head and rechecked comments, inline review comments, reviews, checks, and recent workflow runs.

Findings:

• No maintainer reviews or inline review comments are present.
• GitGuardian Security Checks: pass.
• license/cla: pass.
• GitHub Actions runs show action_required with zero jobs, which appears to be maintainer workflow approval for the fork PR, not a code failure with logs to fix.
• Local PR head matches the remote PR head: 213a1e6d9ae5180515acb1b48200bb520df8f67f.
• Diff remains the intended 2-file change preserving TextMentionTermination.sources through config round-trip, with a focused regression test.

No code-level blocker was found in this sweep. Remaining state is process-side: the PR is still draft and requires maintainer review/workflow approval.

[maxpetrusenkoagent]

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