* chore: enforce flat format for [Unreleased] section in CHANGELOG to reduce merge conflicts
* chore: address review comments - append hint and flexible type in CHANGELOG format
- Pass auto-check job outputs (syntax_ok, has_py_changes, result) as env vars to ai_review.py
- Add _build_ci_context() to build CI status section injected into review prompt
- Update prompt: AI reviewer must reference CI status before judging validation sufficiency
- Clarify blocker vs suggestion: only correctness/security/CI failure/contradiction/missing rollback are blockers
- Update AGENTS.md: add CI coverage principle, blocking conditions, suggestion conditions
1. Add config for custom email sender display name.
2. Auto-switch to English keywords for US/HK stock search to improve accuracy.
3. Add for project collaboration guidelines.
4. Update CI workflow and documentation.
Fixes#251, Fixes#259