GitHub PR Image Upload

Handle explicit local-image evidence requests for an existing GitHub PR or an exact tk-pr-open generic manifest handoff with evidence_required: true. Only the parent handoff is an automatic trigger. When route selection or pre-installation confirmation is needed, prefer the host's native structured question surface (Claude Code: AskUserQuestion; Codex: request_user_input; Hermes: clarify). If unavailable, ask for the same choice in plain chat and do not mutate before selection.

Scope

Handle one bounded upload: validate and stage local images, upload repository-scoped GitHub attachments, minimally update the PR body or selected comment, and verify source/render output. The default target is the PR body.

For tk-pr-open, validate the producer-neutral evidence fields and never branch on, whitelist, or require a producing skill name. If required evidence is missing or invalid, mark the evidence handoff Blocked; do not revert an already-created tk-pr-open PR.