file_upload tool fails with schema-validation error on every call

file_upload throws a schema-validation error on the paths array format it itself requests, on every attempt, regardless of:

• file size (occurs under the 10MB cap, not just over it)
• ref freshness (confirmed against a freshly-resolved DOM ref)
• call formatting (three clean attempts, three identical errors)

Target element was a hidden <input type="file"> located via find (ref resolved correctly, not a DOM-visibility issue). Native file dialog is separately blocked by Chrome's read-tier restriction, so this isn't a case of falling back to the picker either — the DOM-level upload path is independently broken.

Environment: Windows 11, Claude Code CLI, Sitetracker (Salesforce) in Chrome via the claude-in-chrome MCP.