fix(core): omit standalone signed-empty reasoning - #47357

The following comment was made by an LLM, it may be inaccurate:

Based on my search, I found one potentially related PR:

Related PR:

• PR fix(opencode): drop assistant turns without model-visible content from replay #45839: fix(opencode): drop assistant turns without model-visible content from replay
  • fix(opencode): drop assistant turns without model-visible content from replay #45839
  • This PR addresses a similar concern about dropping assistant turns without visible content from replay, which is conceptually related to the current PR's goal of omitting empty reasoning metadata.

However, this is a different fix targeting a different scope (opencode vs core) and the current PR (47357) appears to be the primary fix for issue #46881 about handling standalone signed-empty reasoning turns.

No other direct duplicates found.

@rekram1-node This is now based on v2; the earlier dev base was my mistake. The diff is limited to history replay and its regression test.

Standalone signature-only messages are omitted, but signatures alongside text or a tool call are preserved. The 24 replay tests and the package typecheck pass. Could you review this for #46881 and approve the fork CI when you have a chance?

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