Refactor runtime decomposition and add devnet/testkit architecture foundation#20
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Add the runtime assembly root, kernel/subsystem scaffolding, narrow public node roles, and tx-services optional module. Extract storage, sync, ledger, UTXO, transaction, producer, and devnet boundaries with focused tests and ADR-028 design/tracker docs. Remove pre-release legacy NodeAPI/Yano/raw mempool surfaces and move bundled genesis resources into runtime.
satran004
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Summary
Implements the ADR-028 runtime decomposition work and follow-up devnet/testkit foundation. This refactors the node runtime toward smaller role-based APIs, makes NodeKernel lifecycle/health load-bearing, extracts producer/chronology orchestration, removes deprecated broad compatibility APIs, and keeps ChainState usage behind narrower capability interfaces.
Adds ADR-029 for the devnet control toolkit split and implements the toolkit boundary so DevnetControl lives outside the production runtime artifact while runtime still owns safety-critical rollback, restore, faucet, producer, and time-travel mutation semantics. The follow-up cleanup extracts runtime devnet SPI adapters out of RuntimeNode and prunes unused speculative SPI ports.
Adds ADR-030 for the Yano testkit direction, including JUnit-ready devnet lifecycle helpers, wallet/faucet/query/assertion/snapshot/time helpers, transaction submission/evaluation helpers, CCL BackendService integration planning, and Blockfrost-compatible HTTP fixture planning for non-Java clients.
Also updates ADR-027 as a product and architecture vision document rather than a committed strategic direction, and adds runtime decomposition design documentation.