🐻‍❄️ Propter polar bear: canonical prover protocol

[iChristwin]

🐻‍❄️ This makes the authenticated packed-state prover the repository's protocol implementation, organized into lib, program and host rather than parallel protocol variants.

• Encode each update as a four-byte slot ID plus its absolute replacement word; bind destination, slot, old/new words and used public keys.
• Verify signed nonce/mWh bytes, aggregate whole Wh once per commit, enforce 40/24-bit bounds and preserve untouched lanes.
• Read selected words/keys directly and authenticate them through the contract-reconstructed statement; remove obsolete MPT/header/snapshot code.
• Retain mixed-slot gas admission, Ethereum funding checks, local SP1 execution, cycle/PGU/credit limits, final simulation and confirmed-receipt reconciliation.
• Consolidate protocol/operation documentation in README, keep compatible Streamr ingestion, fix its health handler, and replace obsolete container/node workflows with protocol CI.

Validation: 16 Rust tests passed; the proving-enabled host and pinned SP1 6.3.1 guest build successfully. Four-byte/max-slot boundaries and matching Solidity fixtures are covered. Local SP1 execution passed and matched the host commitment: 594,770 cycles / 698,633 PGU. CI builds and executes the fixture as well. No paid network proof or public-chain transaction was requested.

Gas defaults still admit 647 reused / 322 fresh slots under current pricing, or 454 / 90 under the configured Glamsterdam model, with 15m budgets and 20% headroom. Deployment requires the matching Rollup wire format and the final program key. The locally derived key is 0x00d7ccad99253ce7ee8b85917c04d23c3685645613492931c9ad82efecefe06d; re-derive it after program/toolchain changes. This release uses a bounded one-batch CLI; the old node/container deployment path is retired.

Companion PR: M3tering/Rollup#1

Co-authored with @iChristwin 🐻‍❄️