Add CLI diagnostics reporting support

[hoangsonww]

Summary

• add a .diagnostics meta command to the interactive shell for viewing or exporting system diagnostics reports
• record connections, query timings, and transaction outcomes so diagnostics metrics stay current
• expose an API to refresh database metadata in the diagnostics subsystem during engine initialization

Testing

• cmake -S . -B build -G Ninja
• ninja -C build latticedb_shell

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https://chatgpt.com/codex/tasks/task_e_68d74fe938bc832cbe57e0e838fa07a0

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Project	Deployment	Preview	Comments	Updated (UTC)
lattice-db-next-gen-dbms	Ready	Preview	Comment	Sep 27, 2025 2:53am

[Copilot]

Pull Request Overview

This PR adds CLI diagnostics reporting support to provide system status and performance metrics through an interactive shell command. The implementation includes connection and query timing tracking, transaction outcome recording, and flexible report export capabilities.

Key changes:

• Added .diagnostics meta command for viewing/exporting system diagnostics in text or JSON format
• Integrated diagnostics tracking into database engine for connections, queries, and transactions
• Exposed API to update database metadata during engine initialization

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
src/engine/database_engine.cpp	Integrates diagnostics tracking for database metadata, transaction commits/aborts
src/diagnostics/system_info.h	Adds API method to update database configuration info
src/diagnostics/system_info.cpp	Implements database info update with thread safety
cli_main.cpp	Adds .diagnostics command with format/export options and connection/query tracking

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