v0.1.0-alpha.8

Alpha pre-release v0.1.0-alpha.8

Commit: 6dc4f59 on main (11 commits since v0.1.0-alpha.7)

Highlights:
- Sequencer: setup/run command split + cockroach recovery
- Config: env var names aligned with cartesi/rollups-node
- L1: opt-in plaintext RPC for trusted private hosts
- Watchdog: status.prom metrics; Lua binding/path fixes; Anvil UX polish

Artifacts (Release workflow):
- wallet-sequencer linux amd64 + arm64 tarballs
- Canonical machine images (devnet + sepolia)
- Watchdog OCI: cartesi/sequencer-watchdog:v0.1.0-alpha.8