Move to @pezkuwi/dev 0.86 (eslint 10 toolchain)

- @pezkuwi/dev, dev-test, dev-ts ^0.86.2
- addrcheck.spec: optional call instead of a guard expression
  (@typescript-eslint/prefer-optional-chain)
- checkRepoMeta: drop the initial value every path overwrites
  (no-useless-assignment)
- ipfsUpload: drop a disable directive for a rule the toolchain no
  longer reports

scripts/checkRepoMeta.mjs

@@ -87,7 +87,7 @@ check('the whole repository agrees on one host', hosts.size === 1, [...hosts]);
 
 // And that host is where the code actually is. Without this the metadata can be
 // internally consistent and still point somewhere the code has never been.
-let origin = '';
+let origin;
 
 try {
   origin = execFileSync('git', ['remote', 'get-url', 'origin'], { encoding: 'utf8' }).trim();