README architecture diagram is out of date

[sophiecarreras]

Summary

The architecture diagram in the README understates the current module layout across three directories. This creates a misleading mental model for contributors.

Evidence

Directory	README claims	Actual on disk
commands/	only commands/index.ts	also publicBucketVisibility.ts, renameFile.ts
services/	8 files	11 files (missing errorCode.ts, pathErrorSanitization.ts, sqlJsLoader.ts)
utils/	only utils/humanSize.ts	8 files total

Acceptance criteria

• Architecture diagram updated to reflect current module layout
• (Optional) Consider generating the diagram from disk rather than maintaining it manually

Filed by Quality Keeper drift-audit.