docs: fix oh-my-opencode integration (use categories, simplify model names)

[sunbos]

Description

Fixes incorrect configuration examples for Oh-My-OpenCode integration.

Changes

1. Use Categories: Replaced deprecated agents configuration for dynamic roles (frontend-ui-ux-engineer, document-writer) with the correct categories configuration (visual-engineering, writing).
2. Simplified Model Names: Removed antigravity- prefix from model names to align with the new v1.4.4 naming convention (e.g., google/gemini-3-pro).
3. Consistency: Applied changes to both the "Using with Oh-My-OpenCode" and "Plugin Compatibility" sections.

Why this change?

• Correctness: Oh-My-OpenCode ignores dynamic roles configured under agents. They must be configured via categories to take effect.
• Modernization: Adapts to the upcoming v1.4.4 simplified model naming scheme.

Supersedes #346.

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[greptile-apps]

Greptile Overview

Greptile Summary

This PR corrects Oh-My-OpenCode integration documentation by fixing two critical configuration issues:

• Categories vs Agents: Replaced the deprecated agents configuration for dynamic roles (frontend-ui-ux-engineer, document-writer) with the correct categories configuration (visual-engineering, writing). Oh-My-OpenCode requires dynamic roles to be configured under categories to function properly.
• Model Name Simplification: Removed the antigravity- prefix from model names (e.g., google/gemini-3-pro instead of antigravity-google/gemini-3-pro) to align with the v1.4.4 naming convention documented in README.md:206.

The changes are applied consistently to both the "Using with Oh-My-OpenCode" section (line 384) and the "Plugin Compatibility - oh-my-opencode" section (line 526). The multimodal-looker agent is correctly retained under agents as it's a static agent, not a dynamic role.

Confidence Score: 5/5

• Safe to merge - documentation-only changes with no code modifications
• Changes are limited to README.md documentation updates that fix configuration examples. The updates align with documented v1.4.4 naming conventions and correct the Oh-My-OpenCode integration pattern. No functional code changes, no breaking changes, and consistent application across both affected sections.
• No files require special attention

Important Files Changed

Filename	Overview
README.md	Updated Oh-My-OpenCode configuration examples to use categories instead of deprecated agents for dynamic roles, and simplified model names by removing antigravity- prefix

Sequence Diagram

sequenceDiagram
    participant User
    participant OhMyOpenCode as Oh-My-OpenCode
    participant Config as oh-my-opencode.json
    participant AntigravityAuth as Antigravity Auth Plugin
    participant GoogleAPI as Google Gemini API

    Note over User,GoogleAPI: Configuration Setup
    User->>Config: Configure with categories
    Note over Config: categories: {<br/>  visual-engineering: gemini-3-pro<br/>  writing: gemini-3-flash<br/>}
    Note over Config: agents: {<br/>  multimodal-looker: gemini-3-flash<br/>}
    Config->>OhMyOpenCode: Load configuration
    
    Note over User,GoogleAPI: Dynamic Role Assignment
    OhMyOpenCode->>Config: Read categories for dynamic roles
    OhMyOpenCode->>Config: Read agents for static agents
    Note over OhMyOpenCode: Categories apply to dynamic roles<br/>(visual-engineering, writing)<br/>Agents apply to static agents<br/>(multimodal-looker)
    
    Note over User,GoogleAPI: Model Request Flow
    User->>OhMyOpenCode: Request visual-engineering task
    OhMyOpenCode->>AntigravityAuth: Use google/gemini-3-pro
    AntigravityAuth->>GoogleAPI: Authenticate with OAuth
    GoogleAPI-->>AntigravityAuth: Return response
    AntigravityAuth-->>OhMyOpenCode: Forward response
    OhMyOpenCode-->>User: Task completed

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[NoeFabris]

@sunbos could you check and resolve the conflicts pls?