chore: Release litep2p v0.16.0

[github-actions]

[0.16.0] - 2026-09-30

• kad: Fix local provider eviction and removal panics (#666)
• Report SubstreamOpenFailure when switching to secondary connection (#664)
• Ensure we report connection closed to the upper layers (#663)
• kad: Implement client-server mode for Kademlia (#611)

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Reviewer action required: the changelog entries above are auto-generated from merged PRs and are unsorted. Please edit CHANGELOG.md on this branch to:

• Group the entries under ### Added / ### Changed / ### Fixed.
• Add a short summary paragraph at the top of the ## [0.16.0] section.

Then commit the adjusted CHANGELOG.md to this PR.

After merging: run the Release Publish workflow from the Actions tab with version 0.16.0 to tag master and publish to crates.io. See RELEASING.md.

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CI note: GitHub does not run pull_request workflows on PRs opened by GITHUB_TOKEN. If CI hasn't started on this PR, push an empty commit to trigger it:

git fetch origin && git checkout release-v0.16.0
git commit --allow-empty -m "trigger ci" && git push

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	thiserror@​2.0.20 ⏵ 2.0.21
	quinn-udp@​0.6.1 ⏵ 0.6.3
	hickory-resolver@​0.26.2 ⏵ 0.26.3
	indexmap@​2.14.1 ⏵ 2.14.2
	smallvec@​1.16.0 ⏵ 1.16.2
	uint@​0.10.1 ⏵ 0.10.2	N/A	N/A	N/A	N/A	N/A

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[gab8i]

lgtm!

I would just add a comment about KademliaEvent is not #[non_exhaustive] and #611 added PeersDiscovered, so every exhaustive match over it stops compiling. This describes another portion of the breaking change.

Last thing is the date, it should be the same as the tag date, not yesterday!