v1.0.58

This release promotes the sealed v1.0.58-beta.6 contents to stable.

Changed

• Expanded collaborative workflows — adds full AI Table, Sheet, Minutes,
  approval-event, Drive-comment, document export, and CSV workflow support,
  including safer validation, explicit confirmation for writes, and
  machine-readable completion receipts.
• More capable Chat operations — adds robot image/file messages, toolbar
  management, streaming-card mentions, automatic pagination controls, and
  clearer post-send ID, Markdown-image, paging, and result-shape guidance.
• Reliable Agent and CLI contracts — expands Agent-visible Chat and
  Minutes commands, aligns bundled skills, improves schema/result envelopes,
  and hardens parameter, pagination, runtime-token, and write-result
  verification so ambiguous or incomplete operations fail closed.
• Multi-skill install and upgrade — makes the multi-skill layout the
  default for fresh installs and upgrades while preserving an explicit legacy
  mono option.
• Safer release delivery — strengthens release-equivalent compatibility,
  sealing, package verification, and evaluation-dispatch checks for more
  reliable cross-platform releases.