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ci: idempotent npm release, release on node 26 (#487)

* build: npm packages ship ESM and CommonJS, 3.5.0-0 (#484)

- each package builds lib/ (CommonJS) and lib/esm/ (ESM, with its own
  package.json marking it a module). exports routes import and
  require to their build, each with its own types; bundlers can now
  tree-shake, and an unused import drops out entirely.
- sideEffects: false; types fixed from lib/mod.d.js to lib/mod.d.ts;
  typesVersions maps ./internal for typescript's node10 resolution
  (#300, #331)
- engines: node >= 22, the supported versions
- both builds compile src/ with rewriteRelativeImportExtensions, so
  bin/cjs-fix-imports.ts is gone; transport-node sources use .ts
  import extensions and its examples use import
- depend on nuid 3.1.0-0 and nkeys 2.1.0-0, which ship the same dual
  build; tests use jwt 0.1.0-1 (on nkeys 2.1.0-0, so one nkeys)
- docs: README notes ESM and CommonJS (use one per app) and node 22+;
  migration.md drops the obj crypto caution
- bin/version_manager.ts: bump/fix keep import subpaths (/internal),
  cover import_map.json and peerDependencies, match prerelease
  versions with letters, and honor --preid; with tests
- deno fmt the transport-node examples and README.md
- version 3.5.0-0

* fix(transport-node): main points at lib/mod.js, drop the index.js shim

every other package points main at lib/mod.js; the index.js shim only re-exported it. tests require the package by name, so they go through its exports like users do.

5105 of 5838 branches covered (87.44%)

Branch coverage included in aggregate %.

2 of 2 new or added lines in 2 files covered. (100.0%)

12081 of 13252 relevant lines covered (91.16%)

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