GPT plugin artifacts

Artifact	Path
OpenAPI (Actions)	`openapi/agentstack-mcp.yaml`
Instructions	`instructions/GPT_INSTRUCTIONS.md` (generated)
Overrides	`instructions/overrides.md`
Templates	`templates/custom-gpt-apikey.template.json`, `custom-gpt-oauth.template.json`, `chatgpt-mcp-connector.template.json`
Quickstart	`GPT_QUICKSTART.md`
Tool justifications	`TOOL_JUSTIFICATIONS.md` (2 operations)
Evals	`evals/prompts.yaml`, `evals/expected-actions.yaml`

CI

node provided_plugins/scripts/audit-gpt-plugin.mjs
node provided_plugins/scripts/sync-gpt-instructions.mjs --check

Publish repo: agentstacktech/gpt-plugin