[codex] add advanced agent intelligence operator

[Lschampions]

This change adds a new specialized agent for current-source advanced-agent research and operational synthesis.

The repository already had adjacent coverage for trend research, AI engineering, and multi-agent orchestration, but it did not have a single agent focused on answering a practical question: what is the best current way to build advanced agents, based on fresh signals from official sources, repos, community experimentation, and emerging bot or script patterns. That gap made it harder to use this repository for users who want guidance grounded in what is current rather than static best practices.

The root issue was a missing specialist in the catalog rather than a bug in an existing prompt. Existing agents were either too general, too engineering-focused, or too coordination-focused to cover the combined responsibility of monitoring fast-moving agent ecosystems and turning findings into build-ready recommendations.

The fix adds specialized/advanced-agent-intelligence-operator.md and positions it as an operator with guardrails rather than a research-only agent. The prompt explicitly requires exact dates for current findings, prioritizes primary sources, labels findings as verified, experimental, or high-risk, and converts research into implementation-ready outputs such as ranked stack recommendations, prompt drafts, orchestration patterns, and workflow or script blueprints. The root README roster is also updated so the new specialist is discoverable in the Specialized Division.

Two planning artifacts are included under docs/plans/ to capture the approved design and implementation path for the addition. This keeps the rationale and scope visible alongside the shipped agent content.

Validation was done with direct repository checks after the change:

• confirmed the new agent file exists
• confirmed the README contains the new roster entry
• confirmed the new agent file includes the expected section structure

These checks verified the intended repo-facing result without touching unrelated uncommitted changes already present in the working tree.