feat(storage): report resumable upload progress

[swkeever]

Summary

• add an optional resumable-upload progress callback
• report cumulative uploaded bytes after each successful part
• abort the session if progress handling fails
• document the callback

Verification

• OpenAPI provenance check
• Ruff lint and format
• mypy and Pyright
• 277 unit tests
• contract dry-run
• package build
• Hosting SDK contract and shell-safety tests

[swkeever]

@codex review

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-02T17:30:26.804301Z	0cdc25c	Manual request

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[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Can't wait for the next one!

Reviewed commit: 0cdc25c743

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".