v0.1.0-alpha.9

Alpha pre-release v0.1.0-alpha.9

Commit: 4c4ddcf on main (34 commits since v0.1.0-alpha.8)

Highlights:
- L1 fee oracle: Uniswap V3 TWAP / Fixed, setup-pinned source, log_slack, persisted max-age
- Contracts: rollups-contracts 3.0.0-alpha.6; input scan at app deployment block
- Sequencer API: WS tx context enrichment; direct-input L1 provenance
- Watchdog/security: idempotent init; hide secrets in --help; LUA path fixes
- Ops: bootstrap transient RPC handling; SQLITE_BUSY lease retries

Artifacts (Release workflow):
- wallet-sequencer linux amd64 + arm64 tarballs
- Canonical machine images (devnet + sepolia)
- Watchdog OCI: cartesi/sequencer-watchdog:v0.1.0-alpha.9