Cardano Updates

ScriptPurpose aware memoization of TxInfo

TxSubmission is a pull-based protocol — the server goroutine calls
RequestTxIds to pull transactions from the peer, so it inherently
controls the pace. Rate limiting after the pull was pointless for
network protection and actively harmful: under load, the limiter
rejected batches already received, creating a tight retry loop that
starved chainsync/blockfetch of CPU (20 peers × rate limit checks =
CPU death, BP fell 20 blocks behind on preview).

The natural rate limit is the processing time of RequestTxs +
mempool.AddTransaction. The mempool handles dedup internally.

This reverts ae017a4 and subsequent backoff fixes.

Signed-off-by: wcatz <[email protected]>

- scripts/gerolamo-explorer.ts: CLI that serves both the Bootstrap
  Explorer HTML and the LMDB streaming API on one port (default 3040).
  Supports --port, --lmdb, --no-open, --help. Auto-opens browser on
  WSL/Linux. API routes under /api/ prefix, frontend at /.
- flake.nix: Added devenv scripts (gerolamo-explorer, gerolamo-stream-server)
  so both commands are in PATH when entering the Nix dev shell.
- package.json: Added "explorer" and "stream-server" npm scripts.

Co-Authored-By: Claude Opus 4.6 <[email protected]>

Leios mini-protocols (LeiosFetch, LeiosNotify) were unconditionally
registered on all connections. Non-Leios peers (e.g. cardano-node)
reject the unknown MiniProtocolNum 10 with a muxer error and
immediately reset the connection.

Signed-off-by: Wayne Cat <[email protected]>
Signed-off-by: wcatz <[email protected]>

Full rewrite of the frontend: grid-based page layout (no hardcoded
heights), polished dark theme with Inter + JetBrains Mono fonts,
organized toolbar with integrated input labels, glowing stat
indicators, fixed table columns, custom scrollbars, and default
limit increased to 10000.

Co-Authored-By: Claude Opus 4.6 <[email protected]>

Standalone scripts for reading Mithril LMDB snapshots via Bun FFI
and streaming UTxO data to browser clients for node bootstrapping.

- lmdb-ffi.ts: Bun FFI bindings to liblmdb (dlopen, zero-copy)
- dump-lmdb-utxo.ts: Extract UTxOs from LMDB snapshots to NDJSON
- decode-tvar.ts: Streaming CBOR reader for Cardano tvar files
- mithril-stream-server.ts: NDJSON HTTP streaming server (port 3040)
- bootstrap-explorer.html: Browser UI for visualizing streamed UTxO data
- lmdb-ffi.test.ts: 13 unit tests for FFI layer
- lmdb-dump.c: Legacy C binary (reference only, superseded by FFI)

Co-Authored-By: Claude Opus 4.6 <[email protected]>

Add `mkPlutusTxInfoFromResult` and `toPlutusTxInfoForPurpose` helpers to
aid in using this nested complexity.

Adequate conformance to Version restriction (#5595)