feat: add PPTX run report generation with interactive opt-in prompt

[lbx154]

Description

Summary

• Add PPTX run report generation feature: after each ArgusBot run, optionally generate a PowerPoint slide deck summarizing the run results
• Add interactive confirmation prompt for PPTX report generation (CLI interactive mode, Telegram, and Feishu daemon)
• Add --pptx-report / --no-pptx-report CLI flags for non-interactive control
• Add skills/pptx-run-report/ module with JS-based PPTX generation (pptxgenjs) and Python slide/thumbnail helpers
• Enhance final_report, engine, and state_store with report data collection pipeline
• Add legal AI research package baseline documents under research/
• Add new CLI test suite; refactor and clean up legacy tests

Key Changes

• New modules: pptx_report.py, final_report.py, skills/pptx-run-report/ (JS generator + Python office utils)
• Modified modules: daemon_app.py, cli.py, codex_runner.py, engine.py, telegram_daemon.py, planner.py, reviewer.py, live_updates.py,
  setup_wizard.py
• Removed legacy code: md_checker.py, objective_rewrite.py, output_extractor.py and their associated tests
• Dependencies: added package.json for Node.js (pptxgenjs)

Stats

• 128 files changed, +30,987 / -6,451 lines
• 5 commits

Test Plan

• pytest tests/ passes
• CLI interactive mode: verify PPTX opt-in prompt appears and generates report
• Telegram/Feishu daemon: verify Y/N confirmation flow works
• --pptx-report / --no-pptx-report flags work in non-interactive mode
• Generated .pptx file opens correctly in PowerPoint/LibreOffice