Initial scaffold for OCI Deal Accelerator Codex plugin

Wraps the remote MCP server at https://mcp.tech-lad.com/deal-accelerator/mcp/
and bundles the companion skill for distribution via ai-lad.com.

- .codex-plugin/plugin.json: manifest with Oracle-red branding and 14-tool capabilities
- .mcp.json: streamable HTTP transport pointing at the production MCP URL
- skills/oci-deal-accelerator/SKILL.md: copied from the skill repo
- assets/: placeholder logo, icon, screenshot (replace before first release)
- README: install flow for Windows/macOS/Linux via ai-lad.com

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

README.md

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+# OCI Deal Accelerator — Codex Plugin
+
+Codex plugin that connects to the **OCI Deal Accelerator MCP server** and bundles a companion skill. Distributed internally via [ai-lad.com](https://ai-lad.com).
+
+## What you get
+
+14 tools surfaced through a remote MCP server (streamable HTTP, OAuth 2.1):
+
+- `generate_full_proposal`, `generate_bom`, `generate_bom_appca`, `generate_cost_estimate`
+- `generate_deck`, `generate_diagram`, `generate_business_case`
+- `run_wa_review`, `check_feature_compatibility`, `compare_competitive`
+- `search_reference_architectures`, `search_field_findings`, `report_field_finding`
+- `score_ecal_readiness`
+
+Plus a skill (`skills/oci-deal-accelerator/SKILL.md`) that guides Codex on when and how to invoke each tool.
+
+## Install
+
+Once the plugin is registered in ai-lad.com you will get an `<ID>`. Replace it below.
+
+### Windows (PowerShell)
+```powershell
+iwr -UseBasicParsing 'https://ai-lad.com/api/skills/<ID>/install-script?os=windows' | iex
+```
+
+### macOS / Linux
+```bash
+curl -fsSL 'https://ai-lad.com/api/skills/<ID>/install-script?os=unix' | bash
+```
+
+The installer downloads the plugin ZIP, extracts it to `~/plugins/oci-deal-accelerator/`, merges the `ai-factory` marketplace entry in `~/.agents/plugins/marketplace.json`, and restarts Codex. Policy: `installation: "AVAILABLE"`, `authentication: "ON_INSTALL"`.
+
+## First-run authentication
+
+On first install Codex kicks off the OAuth 2.1 + PKCE flow against the MCP server (AS proxy → OCI Identity Domain). A browser window opens; sign in with your Oracle SSO.
+
+The MCP server implements **Dynamic Client Registration (RFC 7591)**, so Codex's ephemeral `http://localhost:<port>` callback registers itself on the fly — no manual whitelisting in the AS required. Restricted to `@oracle.com` identities.
+
+## Repo layout
+
+```
+oci-deal-accelerator-codex/
+├── .codex-plugin/
+│   └── plugin.json          # Codex plugin manifest
+├── .mcp.json                # Remote MCP server config
+├── skills/
+│   └── oci-deal-accelerator/
+│       └── SKILL.md         # Tool-usage guidance
+├── assets/                  # logo.png, icon.png, screenshot-1.png
+├── README.md
+└── .gitignore
+```
+
+## References
+
+- [Codex Plugins — Build](https://developers.openai.com/codex/plugins/build)
+- [Codex MCP configuration](https://developers.openai.com/codex/mcp)
+- MCP server repo: [github.com/Diegoecab/arch-mcp-oracle](https://github.com/Diegoecab/arch-mcp-oracle)