Add airwallex-agentos plugin (finance workflow skills + MCP)

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What this PR does

Adds the official airwallex-agentos plugin to the xAI plugin marketplace as a remote-source catalog entry. No plugin code is vendored here.

• Plugin name: airwallex-agentos
• Type: remote source
• Source URL + pinned SHA: https://github.com/airwallex/airwallex-marketplace.git at 5cb3dd8b63e5ac873add34191e1994a1475ce145, path plugins/airwallex-agentos
• Homepage: https://www.airwallex.com/docs/developer-tools/ai/agentos

Ownership

• I own this plugin or have the right to distribute it.
• The source repo is published under the official org (airwallex).

This is a catalog index PR pointing at the vendor's official public repository. I am not affiliated with airwallex; the listing is sourced from that org's public plugin so Grok Build users can install it from the official marketplace.

Checklist

• Added exactly one entry in .grok-plugin/marketplace.json (valid JSON, kebab-case name).
• Remote source pins a full 40-char lowercase commit sha; the commit is public and reachable.
• Regenerated .grok-plugin/plugin-index.json (python3 scripts/generate-plugin-index.py).
• python3 scripts/validate-catalog.py passes locally.
• python3 scripts/generate-plugin-index.py --check passes locally (generated from the full catalog, then this PR keeps only this plugin's index key).
• homepage + clear description set; keywords/domains are brand-scoped.
• License is stated: Apache-2.0

Security

• No curl | bash, remote-code download/exec, or postinstall RCE in the catalog entry.
• No reading/exfiltration of secrets, tokens, .env, or env vars in the catalog entry.
• MCP/hooks scope is whatever the upstream plugin ships — see notes.

Network endpoints this plugin calls: https://mcp.airwallex.com/mcp (AgentOS) and https://mcp.sandbox.airwallex.com/developer (developer/sandbox, also declared on this plugin).

Credentials/permissions it requires: OAuth for MCP, or airwallex auth login for the CLI. No secrets in the plugin repo.

Notes for reviewers

Official Airwallex marketplace already documents Grok install. Skills: contract-to-billing, beneficiary-creation, card-provisioning, manage-cashflow, awx-best-practices. The skills explicitly do not initiate money-out actions. Manifest is .claude-plugin/plugin.json.

Install after merge:

grok plugin install airwallex-agentos --trust