Artifact public sharing blocked: "This version can't be shared publicly" on every version and fresh artifacts (Max plan, CLI 2.1.233)

Summary

Artifact public sharing is blocked with "This version can't be shared publicly. Publish a new version or change the shared version, then try again." for every version of every artifact published from this account, including brand-new artifacts. Private viewing renders fine.

This is the same symptom as #85550 (closed) and related to #81410 / #79824 — reporting that it still reproduces on CLI 2.1.233.

Environment

• Claude Code CLI 2.1.233, macOS (darwin 25.5.0)
• Max subscription (no ANTHROPIC_API_KEY; consumer account, not Team/Enterprise, so the documented Team/Enterprise public-sharing restriction should not apply)
• Artifacts published via the Artifact tool from an interactive CLI session

Repro

1. Publish a self-contained single-file HTML artifact (static fan site: HTML/CSS/vanilla JS, images inlined as base64 WebP data URIs, no external requests, no eval / new Function).
2. Open the artifact page → Share → keep Shared version: Latest → set General access to "Anyone with the link".
3. Red error appears: "This version can't be shared publicly. Publish a new version or change the shared version, then try again."

What was tried (all blocked with the same message)

• Republishing new versions (6 versions total over ~40 minutes)
• Shared version pinned to a specific version vs. Latest
• Publishing a brand-new artifact (different UUID) with identical content
• Waiting several minutes between publish and share attempt (in case of an async scan)

Notes against the obvious explanations

• Not the 16MB cap: the first blocked version was ~448 KB; the current one is ~1.5 MB.
• Content is a benign static car fan site; no external fetches, no obfuscated code.
• Private rendering of every version works normally.

Artifact UUIDs for backend lookup: 1b77e3bb-419d-4dde-9e24-aaa595dc8b3a and 206f5a2c-54cd-4ba6-9c2d-2b01a234a266.