[zhaoxiongfei]

Addresses #68, #69, #71 and #72, with release preparation improvements for #70.

• Keep shared edition guards and describe unavailable writes without directing users to a private product.
• Show the README workflow and an existing PowerPoint fixture before installation. Refresh chart workbook, Word review, and text-formatting guidance. Mark translated READMEs as partial.
• Move four preview-only dependencies to optional installs, load preview dependencies lazily, and report missing dependencies during preflight. Bound isomorphic-git and zod to the tested majors. The lockfile also corrects the published 1.9.8 converter dependency mismatch.
• Document the TypeSafe credential, data sent, and offline inspection alternatives in README, help, agent context and Skill.
• Backfill the changelog from 1.6.0 through 1.9.8, remove the stale Skill version, and require the matching changelog and release tag before publishing.

A warm-cache local dependency comparison was 160.4 MB and 2.31 s with the four preview packages, versus 59.1 MB and 0.85 s without them. This is a single comparison, not a WorkBuddy timing result. Installed with npm --omit=optional, new/add/validate/export passed and preflight returned a structured, nonretryable missing-dependencies error. A full installation rendered a PNG in Chrome. Historical releases remain a separate metadata task.