refactor: CI pipeline

[zannis]

CI/CD Pipeline Refactor

Split the monolithic 824-line ci-cd.yml into two focused workflows.

ci.yml — Lint & Test

Runs on PRs and pushes to master.

• fmt — rustfmt check
• clippy — clippy lint check
• test — two runs:
  • Default features (kafka on, reth off) — covers #[cfg(not(feature = "reth"))] paths
  • All features (reth, jemalloc, kafka, debug-json) — covers #[cfg(feature = "reth")] paths
• coverage — cargo-llvm-cov + cargo-nextest, uploaded to Codecov in lcov format
• Ubuntu-only, with Swatinem/rust-cache@v2 on all jobs
• concurrency group cancels superseded PR runs

release.yml — Release Pipeline

Runs on pushes to release/** branches and master.

• version-bump — uses cargo-edit (cargo set-version) to bump cli/ and core/ versions, commits and pushes
• create-pr — creates a release PR to master (idempotent)
• release-build — builds cross-platform binaries (linux, macOS Intel/ARM, Windows), only on master after a release commit merge
• release — creates a GitHub Release and uploads binary assets

Removed

• Binary builds on every PR — was building across 4 platforms with a 240-minute timeout
• Duplicate test runs — previously ran tests twice (with/without reth separately); now uses default vs --all-features which properly exercises both cfg branches
• sed-based version bumping — replaced by cargo set-version
• Dead code — Linux ARM cross-compilation steps (target was never in the matrix), commented-out changelog update block

Setup required

• Add a CODECOV_TOKEN secret to the repository (Settings → Secrets and variables → Actions) for coverage uploads

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