Installation overwrites existing opencode.json configuration

[Pablo-GNU]

Issue: gentleman-dots installation overwrites existing opencode.json configuration

Description

When installing the full ecosystem using gentleman-dots, the process removes or overwrites my existing opencode.json configuration file that was previously created by gentle-ai.

This causes an important problem because I lose my existing orchestration setup, including:

• Plugins configuration
• MCPs configuration
• Orchestration settings
• Other custom adjustments

As a result, I am forced to manually reconfigure the entire system every time I run the installation.

Expected behavior

The installation process should preserve the existing opencode.json file instead of replacing it.

If gentleman-dots needs to add new configuration values, it should:

• Keep the existing configuration intact
• Only add missing fields
• Update only what is strictly necessary
• Avoid destructive overwrites

Suggested solution

Instead of replacing the file, the installer could merge configurations by:

• Checking if opencode.json already exists
• Backing it up if modifications are required
• Performing a non-destructive merge of the configuration
• Only injecting required new values

Why this matters

Many users may already have a working configuration created by gentle-ai, and overwriting it creates unnecessary friction and setup time.

Preserving user configuration would make the installation process safer and more user-friendly.

Possible workaround

Currently, the only workaround is manually backing up opencode.json before running the installation and restoring it afterward.

[Alan-TheGentleman]

Bug real. Ya tenemos el precedente del merge no-destructivo para settings.json — hay que aplicar la misma filosofía a opencode.json.

El approach correcto:

1. Verificar si existe
2. Si existe, mergear keys faltantes solamente
3. No pisar lo que ya está

Aprobado. Candidato a un PR enfocado.