Chatgpt Upload Fallback

# ChatGPT Pro Upload Fallback Implementation Plan

> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.

**Goal:** Make the ChatGPT collaboration harness diagnose Chrome local-file denial without overclaiming its cause, stage approved PNGs through a verified clipboard fallback, synchronize the installed runtime copy, and integrate the validated change into `main`.

**Architecture:** Keep `SKILL.md` as the compact router, place Chrome file-chooser diagnosis in `references/chrome-chatgpt-pro.md`, and place PNG-only verified clipboard staging and exact-packet evidence rules in `references/file-artifact-exchange.md`. Enforce the process with repository contract tests, then mechanically synchronize and independently validate the installed runtime copy.

**Tech Stack:** Markdown skills and references, Python 3 `unittest`, Codex skill validator with PyYAML, Chrome browser-client runtime, Git.

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## File Structure

- Modify: `tests/test_skill_catalog.py`
- Modify: `skills/chatgpt-collaboration-harness/SKILL.md`
- Modify: `skills/chatgpt-collaboration-harness/references/chrome-chatgpt-pro.md`
- Modify: `skills/chatgpt-collaboration-harness/references/file-artifact-exchange.md`
- Synchronize after repository validation: `~/.codex/skills/chatgpt-collaboration-harness/`

No new dependency, script, configuration file, browser-profile edit, or skill
directory is required.

### Task 1: Add The RED Skill Contracts

**Files:**
- Modify: `tests/test_skill_catalog.py`
- Test: `tests/test_skill_catalog.py`

- [ ] **Step 1: Add the Chrome upload diagnosis test**

Add this method to `SkillCatalogTests`: