Include call IDs in MCP requests and clarify metadata config

[copyberry]

Include call IDs in MCP requests and clarify metadata config

What changed

• Add the tool call ID to _meta.callId for every MCP tool request.
• Rename features.tool_registry.include_tool_metadata to
  features.tool_registry.turn_metadata_includes_tool_info to clarify that the
  setting controls authoritative tool information in per-turn metadata.
• Update config parsing, schema generation, and session config locking for the
  renamed setting.

Testing

• Cover callId metadata for custom, plugin, and Codex Apps MCP calls.
• Update strict-config, config-loading, feature-config, and config-lock tests for
  the renamed setting.

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