fix: handle trailing commas in config JSON during installation and uninstallation

[thaikolja]

Pull Request Description

Summary

Fixes a SyntaxError: Expected double-quoted property name in JSON error during installation/uninstallation when opencode.json contains trailing commas (a common issue in hand-edited JSON configuration files).

Root Cause

When executing install-opencode.sh or install-opencode.ps1 (as well as the corresponding uninstall scripts), the script attempts to parse ~/.config/opencode/opencode.json using standard JSON parsers (JSON.parse in Node.js, ConvertFrom-Json in PowerShell). If the JSON file contains trailing commas, standard parsers throw a syntax error and terminate script execution.

Changes

• install-opencode.sh & uninstall-opencode.sh:
  • Wrapped JSON.parse in a try...catch block.
  • Added a fallback regex (content.replace(/,\s*([\]}])/g, "$1")) to strip trailing commas before parsing JSON in Node.js.
• install-opencode.ps1 & uninstall-opencode.ps1:
  • Wrapped ConvertFrom-Json in a try...catch block.
  • Added a fallback regex ($content -replace ',\s*([\]}])', '$1') to strip trailing commas before parsing JSON in PowerShell.

Verification

• Created an opencode.json configuration containing trailing commas (e.g., "caveman-compress": "allow",}).
• Confirmed both Bash (install-opencode.sh) and PowerShell (install-opencode.ps1) scripts parse the file gracefully, apply configuration changes, and write back clean valid JSON.
• Confirmed uninstall-opencode.sh and uninstall-opencode.ps1 successfully process files with trailing commas.