chore(main): release metis 1.6.0

[mpekatsoula]

🤖 I have created a release beep boop

1.6.0 (2026-08-19)

Features

• codegraph: reduce review input tokens (#300) (a26dfda)
• codegraph: strengthen deterministic reachability review (#296) (c7c2735)
• engine: add execution node foundation (#285) (c2bfb29)
• execution: modularize execution graph (#290) (cafa73f)
• memory: add advisory git-history context (#283) (5925e4d)
• memory: apply threat-model context to review and triage (#282) (6153ea0)
• memory: initialize threat-model repository memory (#281) (49d6f5a)
• plugins: add AArch64 assembly .hs extension (#266) (e5320d7)
• prompts: externalize engine prompt resources (#284) (4d52b9d)
• Qdrant Vector Search (#291) (933ca31)
• runlog: add explainable workflow tracing for CLI and engine runs (#292) (ea6b4ed)

Bug Fixes

• Fix: (403e1e1)
• plugins: restore Solidity manifest (#301) (36d495c)
• triage: stop repeated tool retries (#297) (eb74b70)

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