chore: update project dependencies and metadata in pyproject.toml

refactor: remove TCBS source support and update test parameters to KBS

refactor: align KBS price board schema, add AI agent guardrails, and introduce sponsor migration utilities

refactor: rename market-events.py to market_events.py and update pyproject.toml.

feat: Add market events module and enhance upgrade suggestion messages.

chore: bump version to 3.4.3 in pyproject.toml

feat: Enhance upgrade process with environment detection and tailored commands

feat: Add market events utility module.

Remove TCBS data provider and Screener API.

feat: add pandas compatibility utilities and enhance frequency handling in data processing

fix: update Python script execution method in CI workflow for API key verification

feat: enhance CI workflows with API key setup and verification, improve linting and testing configurations

fix(deps): add pytz to project dependencies (#217)

docs: update agent guide file copying instructions for macOS/Linux and Windows.

fix: Add fallback to fetch symbols by exchange if the initial listing lacks an exchange column.