chore: replace git-chglog automation with git-cliff

[scarmuega]

Summary

• Replace git-chglog (Go) with git-cliff (Rust) for changelog and release-note generation, mirroring the setup in txpipe/dolos for cross-repo consistency.
• Add cliff.toml at the repo root (copied from dolos) with conventional-commit parsers and emoji-grouped sections.
• Wire git cliff into cargo release via [workspace.metadata.release] so future releases regenerate CHANGELOG.md automatically as a pre-release-hook.
• Swap the GitHub release workflow to orhun/git-cliff-action@v4 (--latest --strip header) — no more Go toolchain install.
• Regenerate CHANGELOG.md so existing history matches the new format.

Test plan

• Confirm cliff.toml parses: git cliff --latest locally
• Verify the Release workflow renders sensible notes when the next v* tag is pushed
• (Optional) dry-run cargo release --workspace --execute=false to confirm the pre-release-hook fires

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 48518324-8c4d-4204-a4dc-3bd27e432b79

📥 Commits

Reviewing files that changed from the base of the PR and between a435d5d and fbbef66.

📒 Files selected for processing (8)

• .chglog/CHANGELOG.tpl.md
• .chglog/config.yml
• .github/chglog/RELEASE.tpl.md
• .github/chglog/release.yml
• .github/workflows/release.yml
• CHANGELOG.md
• Cargo.toml
• cliff.toml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/migrate-to-git-cliff

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