feat: opencode release v1.18.34

[github-actions]

What's Changed

Core

Bugfixes

• Send namespaced session and parent-session identity headers with model requests.
• Re-sign locally compiled macOS binaries so they run reliably on macOS 27+. (@ryangamerdev)
• Sign macOS CLI release binaries with a Developer ID.

Thank you to 3 community contributors:

• @dc85:
  • docs(web): correct GPT 6.1 Sol cache pricing (#52176)
• @metal-huang:
  • fix(tui): use path.sep for plugin name extraction in /status dialog (#52328)
• @ryangamerdev:
  • fix(opencode): ad-hoc re-sign darwin binaries after local compile (#52183)

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Full Changelog: https://github.com/anomalyco/opencode/releases/tag/v1.18.34

This PR was created automatically by a scheduled workflow.