chore(master): release 1.6.0

[github-actions]

🤖 I have created a release beep boop

1.6.0 (2026-05-06)

Features

• integrate Kronos foundation model into fin_quant R&D loop (ff1a9d6)
• run Kronos on CPU to avoid GPU conflict with llama-server (9cab556)

Bug Fixes

• add missing debug() method to RDAgentLog (1ce53f2)
• prevent LLM retry loop from consecutive assistant message corruption (c1e278d)

Documentation

• add precise release trigger rules (5+ feats, 10+ fixes, 30+ commits, major feature, security) (2221f87)

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