feat(memory): add configurable read-only toolset for memory extraction

[heaoxiang-ai]

Motivation

• Make the set of read-only tools available to the memory extraction LLM configurable so different deployments can trade off cost vs recall quality without code changes.
• Ensure safety by restricting available tools to read-only operations and preventing the LLM from attempting edits without first reading existing files.
• Align extraction prompt text with actual runtime capabilities to avoid model confusion when prompt and behavior diverge.

Description

• Added a new memory.llm_tools field to MemoryConfig in openviking_cli/utils/config/memory_config.py with a safe default of ["read", "search"] and allowed values read, search, ls.
• Implemented validation that deduplicates tools, preserves order, enforces allowed values, and requires read to be present for safety in validate_llm_tools.
• Updated SessionExtractContextProvider in openviking/session/memory/session_extract_context_provider.py to source allowed tools from get_openviking_config().memory.llm_tools and to inject the configured tool list into the extraction system instruction.
• Updated examples/ov.conf.example to show "llm_tools": ["read", "search"] and added unit tests in tests/test_config_loader.py to cover defaults, dedup behavior, invalid tool rejection, and the requirement that read be present.

Testing

• Compiled the modified modules with python -m compileall openviking_cli/utils/config/memory_config.py openviking/session/memory/session_extract_context_provider.py tests/test_config_loader.py, which succeeded.
• Verified basic behavior of the MemoryConfig logic locally, but running the full test suite or pytest in this environment failed due to missing runtime dependencies (yaml, json_repair) and the test bootstrap, so the new tests were not executed under pytest here.
• Changes were committed with message feat(memory): make extraction LLM tools configurable and include the modified example and added tests.

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Codex Task

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