Orgchain v1.9: lineage/v0 as an ordinals metaprotocol, rehearsed on regtest

SPEC.md writes lineage/v0 down as an ordinals metaprotocol: the envelope
fields, chain order, authority by verified parents, every rule, ownership by
sat. bin/lineage-index.mjs reads lineage events from a real ord server and
folds them with the same reducer the lab uses.

tools/regtest rehearses the sample on Bitcoin Core regtest with standardness
on: the lab's own action code signs on a chain funded only by coins imported
from regtest (LocalChain.importCoin), each beat's transactions are broadcast
byte for byte and mined, ord indexes them, and --compare checks the same
events in the same beats, the same metadata and parents, every inscription
in the same output and the same trees. tests/indexer.test.js replays a
recorded run.

The first rehearsal found that reveals committed to tapscript's re-encoded
tapleaf, which real Bitcoin rejects. They now commit to the exact script
bytes, and the local chain checks script paths per BIP-341/342, still
loading reveals made before.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01H4upF5LVwmPDDqrhdUfnXh

tools/regtest/rpc.mjs

@@ -0,0 +1,20 @@
+// A small JSON-RPC client for the local regtest bitcoind (tools/regtest/README.md), authenticated with its cookie.
+import { readFileSync } from 'node:fs';
+import { homedir } from 'node:os';
+import { join } from 'node:path';
+
+export const DATADIR = process.env.LINEAGE_REGTEST ? join(process.env.LINEAGE_REGTEST, 'bitcoin') : join(homedir(), 'lineage-regtest', 'bitcoin');
+
+export function bitcoind({ url = 'http://127.0.0.1:18443', datadir = DATADIR, wallet = null } = {}) {
+  let id = 0;
+  return async (method, ...params) => {
+    const cookie = readFileSync(join(datadir, 'regtest', '.cookie'), 'utf8').trim();
+    const res = await fetch(wallet ? `${url}/wallet/${wallet}` : url, {
+      method: 'POST', headers: { Authorization: `Basic ${Buffer.from(cookie).toString('base64')}`, 'Content-Type': 'application/json' },
+      body: JSON.stringify({ jsonrpc: '1.0', id: ++id, method, params }),
+    });
+    const body = await res.json().catch(() => null);
+    if (!body || body.error) throw new Error(`${method}: ${body?.error?.message ?? `HTTP ${res.status}`}`);
+    return body.result;
+  };
+}