Make v2 memory lock acquisition configurable and resilient

[heaoxiang-ai]

Motivation

• The v2 memory extractor used an unbounded while True loop to acquire subtree locks, which can block session commits indefinitely under contention.
• Provide operational controls so operators can tune retry pacing and impose an upper bound on lock acquisition attempts.

Description

• Added two new memory configuration fields in MemoryConfig: v2_lock_retry_interval_seconds and v2_lock_max_retries to control retry pacing and limits.
• Updated SessionCompressorV2.extract_long_term_memories to honor the new config values, perform paced retries using asyncio.sleep, and raise TimeoutError when the retry limit is hit.
• Kept existing behavior of ordered batch locking to avoid deadlocks while making retries observable via logs.
• Added unit test test_v2_lock_acquire_respects_max_retries to validate that the extractor stops retrying after the configured maximum and that the retry loop is exercised.

Testing

• python -m compileall openviking/session/compressor_v2.py openviking_cli/utils/config/memory_config.py tests/session/memory/test_compressor_v2.py completed successfully.
• Attempted to run the targeted pytest for the new test, but the test bootstrap (tests/conftest.py) failed at import time due to a missing yaml dependency in the environment, so the new test was not executed in this run.
• The new test is included and designed to run in CI where project test dependencies are satisfied.

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Codex Task

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