fix(simplelog): repair the /otel entry, which threw on import in 2.0.0

[MurkyTheMurloc]

SyntaxError: Export named 'setSpanContextReader' not found in module
  .../@murky-web/simplelog/dist/logger_factory.js

The build runs two tsdown config blocks, one platform: "node" and one platform: "neutral", writing to the same outDir. logger_factory was an entry in neither, so each block emitted it keeping only the exports its own entries used, and whichever finished last decided the file. The neutral block's entries — deno, hono, web — never call setSpanContextReader, so when it won, the export was gone and dist/otel.js imported a binding that did not exist.

The order is not fixed. Rebuilding the broken config five times produced a working file once and a broken one four times, which is how this reached npm: the release build happened to land on the losing order.

Naming logger_factory as an entry in both blocks preserves its full export surface regardless of order. Verified stable over repeated builds.

smoke:entries imports every subpath in the exports map from the built output and fails when one will not load or exports nothing. It runs in release:verify:simplelog. Nothing already in place could have caught this: lint and typecheck read the source, and the generated otel.d.ts described the very export the JavaScript lacked, so the declaration agreed with the code that was never emitted. Only loading the built files shows it. Bisected: the new check fails on the unfixed build and passes on the fixed one.

Claude-Session: https://claude.ai/code/session_015zGgcXsDCDPNCSzhAWn1Zm