Add the foundational scaffolding for the signet-rpc-storage crate, which
provides an Ethereum JSON-RPC server backed by signet-storage's unified
storage backend, independent of reth's FullNodeComponents.

This includes:
- Workspace dependency additions (signet-storage, signet-cold, signet-hot,
  signet-storage-types)
- StorageRpcCtx context struct with Arc<Inner> pattern
- BlockTags atomic block tag tracker for Latest/Safe/Finalized
- Block ID and block tag resolution utilities
- Stub eth module (endpoints to be added in follow-up)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

- Extract `resolve_evm_block` method on `StorageRpcCtx` to deduplicate
  the block resolution + header fetch + revm db creation shared by
  `call()` and `estimate_gas()`. Resolves headers directly (by hash or
  by tag→number) to avoid redundant cold storage lookups.
- Replace glob import `use endpoints::*` with explicit imports.
- Remove unused `revm_state()` method from `StorageRpcCtx`.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Add gas oracle, filters, subscriptions, debug tracing, and signet
namespaces to signet-rpc-storage. Port 15 endpoints from the old
reth-backed signet-rpc crate to the storage-backed architecture.

New modules:
- gas_oracle: cold-storage gas price oracle (suggest_tip_cap)
- interest/: filter manager, subscription manager, block notifications
- debug/: traceBlockByNumber, traceBlockByHash, traceTransaction
- signet/: sendOrder, callBundle

Wired eth endpoints: gasPrice, maxPriorityFeePerGas, feeHistory,
newFilter, newBlockFilter, uninstallFilter, getFilterChanges,
getFilterLogs, subscribe, unsubscribe.

Integration tests cover gas/fee queries, filter lifecycle, and
debug tracing with noop tracer.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* refactor: rewrite block processor to use signet-hot storage

Replace the reth ProviderFactory-based storage with HotKv for rollup
state reads. The processor becomes a stateless executor that reads from
hot storage, runs the EVM, and returns ExecutedBlock. Extraction is
moved to the node (PR3) to avoid lifetime issues with borrowed Extracts.

- Replace Db: NodeTypesDbTrait generic with H: HotKv
- Replace state_provider_database() with revm_state() using RevmRead
- Remove on_host_commit() and commit_evm_results()
- Add process_block() returning ExecutedBlock
- Add build_executed_block() for type conversion
- Remove signet-db, signet-node-types, reth-exex, reth-node-api deps
- Add signet-hot, signet-storage-types deps
- Remove Chain/PrimitivesOf/ExExNotification type aliases from lib.rs

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* refactor: rewrite signet-node to use unified storage and rpc-storage

Replace reth's ProviderFactory/BlockchainProvider with UnifiedStorage
and swap signet-rpc for signet-rpc-storage. The node now holds
Arc<UnifiedStorage<H>> and shares state with the RPC context through
BlockTags (atomic block tag tracking) and broadcast::Sender
(new block notifications).

Key changes:
- StorageRpcCtx accepts Arc<UnifiedStorage<H>> for shared ownership
- Node struct uses HotKv generic instead of NodeTypesDbTrait
- Block processing uses signet-extract's Extractor + ExtractableChainShim
- Genesis loading via HistoryWrite::load_genesis + UnsafeDbWrite::commit
- Fix metrics bug: record_notification_received now correctly increments
  the received counter instead of the processed counter

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* refactor: rewrite node-tests to use unified storage and align gas oracle

Replace TmpDb/ProviderFactory with MemKv/UnifiedStorage in all node test
infrastructure. Update signet-storage crates to v0.6.2 to fix MemKv
intra-transaction read visibility.

Align the cold-storage gas oracle with reth's GasPriceOracle by adding
default_gas_price (1 Gwei), ignore_price (2 wei), and max_price (500
Gwei) to StorageRpcConfig.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* refactor: delete signet-db, signet-node-types, and signet-rpc

These crates are fully replaced by signet-storage, signet-hot, and
signet-rpc-storage respectively. Remove 6,700+ lines of dead code and
clean up 22 unused workspace dependencies.

Replace reth-db tempdir_path with tempfile in signet-node-config.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* refactor: rename signet-rpc-storage to signet-rpc

Reclaim the signet-rpc name now that the old reth-backed crate is
deleted. Rename directory, package, and all import paths.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* refactor: restore RUN EVM ascii art banner

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: resolve clippy empty_line_after_doc_comments warning in ascii banner

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: address PR review — bugs, style, and test infra

- Fix log_index per-receipt → per-block (kind.rs)
- Fix hash/height mismatch in update_highest_processed_height (node.rs)
- Fix serve_ipc panic: expect → ? (serve.rs)
- Use seal_unchecked to avoid redundant header re-hashing (processor.rs)
- Refactor imperative event loop → functional chain (processor.rs)
- Add #[instrument(skip_all)] to run_evm and build_executed_block
- Add TODO for two-reader consistency risk (processor.rs)
- Group signet_hot imports across 6 RPC files
- Move supported methods above "Unsupported" comment (eth/mod.rs)
- Hoist function-scoped imports to module level (eth_rpc.rs)
- Fix stale signet_rpc_storage reference (eth_rpc.rs)
- Differentiate HTTP/WS doc comments, fix Result type (serve.rs)
- Wrap cold storage polling loop in 30s timeout (context.rs)
- Remove dead signet_events_in_range method (context.rs)
- Update README to reflect new API types

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

… Paris

`EthereumHardfork` is a bitflags type where each hardfork is an
independent bit. All callers of `load_genesis()` were passing only
`EthereumHardfork::Paris`, so `genesis_header()` never set
`base_fee_per_gas` (a London feature) because the London bit was unset.
The test context worked around this by patching the header after the
fact.

This adds `genesis_hardforks()` to signet-genesis, which derives the
correct set of active hardfork flags by inspecting the chain config's
activation blocks and timestamps. Per-network LazyLock statics and a
`GenesisSpec::genesis_hardforks()` method are also provided. The
workaround in the test context is removed.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

The builder previously only loaded genesis into hot storage. Cold-backed
RPC queries for block 0 would fail. Now prebuild checks cold
independently and writes the genesis block if absent.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

… merge gas cache

- Bump signet-sdk crates from 0.16.0-rc.8 to 0.16.0-rc.11
- Migrate to new block primitives (Sealed<Header>, SealedBlock<T>)
- Replace ChainSpec with EthereumHardfork bitflags in block processor
- Restructure processor to be instantiated per-block instead of held
- Merge build_executed_block into run_evm, change map_err to wrap_err
- Fix changed flag: on_host_revert/process_committed_chain return bool
- DRY reader/last_block/drop pattern into last_rollup_block() helper
- Remove blank line between imports in gas_oracle.rs
- Merge PR #80: add lock-free GasOracleCache for tip suggestions

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

…C config

Fix EVM spec_id for RPC calls: all EVM execution paths (eth_call,
eth_estimateGas, eth_createAccessList, debug tracing, bundle simulation)
now derive the correct SpecId from chain config + block header instead of
defaulting to PRAGUE.

Move serve.rs from signet-node to signet-rpc: transport infrastructure
(HTTP/WS/IPC) is now reth-free, using tokio::spawn and Handle::current()
instead of reth's TaskExecutor. This removes axum, tower-http, interprocess,
and ajj dependencies from signet-node.

Load StorageRpcConfig from host RpcServerArgs: rpc_gas_cap,
max_tracing_requests, and gas price oracle settings now flow through from
reth's CLI args instead of always using defaults.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

- Fix off-by-one in calculate_reward_percentiles that could skip the
  last transaction or panic on index out of bounds
- Remove unused parent_header SealedHeader conversion in block processor
- Use spawn_with_ctx (async) instead of spawn_blocking_with_ctx for
  send_order which only does async work
- Add clarifying comment on per-block hardfork construction in node

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>