fix: log block eigenvalue summary events

[he-yufeng]

Summary

• use the eigenvalues from self.block_eigenvalue.values() when building monitor summary events
• avoid indexing the Python 3 dict_values view
• add focused coverage for the eigenvalue summary-event path without constructing a full engine

Fixes #7983.

To verify

• python -m py_compile deepspeed\runtime\engine.py tests\unit\runtime\test_engine.py (passed)
• git diff --check (passed)
• python -m pytest tests\unit\runtime\test_engine.py -q was attempted on Windows, but collection failed before the test ran because this clone has core.symlinks=false and deepspeed/accelerator was checked out as a plain text symlink file, so deepspeed.accelerator cannot be imported locally. The new test should run in the normal Linux checkout used by CI.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Add the required DeepSpeed Team header

In this new test file, the workspace AGENTS.md requires new files to include the license header # SPDX-License-Identifier: Apache-2.0 followed by # DeepSpeed Team; this header omits # DeepSpeed Team and adds a different first line, so it violates the repo's required new-file header.

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