ExcelMaster v0.6.42

This release adds the first provenance review experience and improves reliability across live Excel automation, sign-in recovery, and model routing.

• Workbooks that contain provenance ledgers can now open a dedicated review sidebar, including local PDF evidence rendering and embedded evidence extraction.
• Excel automation now gives clearer guidance for common COM failures such as merged cells, busy Excel states, and workbook access problems.
• Long-running Excel Python tasks are supervised more carefully, with stronger guards against unsafe direct live-Excel script execution.
• The add-in is more resilient around backups, floating SmartAction cards, login callbacks, and large write operations.
• Session verification now separates retryable service outages from real authentication rejection, reducing accidental sign-out behavior during transient backend trouble.
• Model routing and prompt guardrails were refreshed, including Kimi and GLM catalog updates.
• The VBA learning library now includes additional localized articles for control flow, data objects, string functions, Office integration, and related topics.

For most users, this should feel like a steadier ExcelMaster: fewer dead ends when Excel is busy or protected, clearer recovery instructions, and a new review workflow for source-backed workbooks.