Draft release notes for v1.16.6

[Copilot]

Drafted comprehensive release notes for the upcoming v1.16.6 maintenance release.

Changes

• Created RELEASE_NOTES_v1.16.6.md with categorized changelog covering 37 merged PRs from milestone 195
• Organized into 7 sections: Core, RPC & Tracing, Networking & P2P, CLI & Commands, JavaScript Runtime, Testing & CI, Code Quality & Maintenance
• Followed established format from v1.16.5 and prior releases (HTML comment title, section structure, download links footer)

Key highlights included

• Trienode history restructuring with partial freezer reads (core/rawdb, triedb/pathdb: re-structure the trienode history header #32907)
• New --genesis flag for genesis configuration (cmd/geth: add flag to set genesis #32844)
• Multiple bug fixes: prestateTracer, TraceCall with BlockOverrides, discovery bootstrap timing
• Performance improvements: reduced allocations in AccessList.Copy and modernSigner.Equal
• Test stability fixes for flaky tests

The release notes are ready for use when publishing v1.16.6 to GitHub releases.

Warning

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• https://api.github.com/repos/ethereum/go-ethereum/milestones/195
  • Triggering command: curl -s REDACTED (http block)

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Original prompt

Draft release notes for the next release

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