[Plugin] GitHub Desktop: manage config.json settings

[DotDev262]

Plugin: GitHub Desktop Config Provider

Manage GitHub Desktop application settings stored in config.json.

Config File Location

Platform	Path
Windows	%APPDATA%\GitHub Desktop\config.json

Settings

Common settings that can be managed:

• theme — UI theme (light, dark, system)
• defaultBranchName — Default branch name for new repos
• confirmRemovedFiles — Confirmation on file removal
• confirmDiscardChanges — Confirmation on discard
• usageStats — Telemetry opt-in/out
• signCommits — Sign commits by default
• selectedTheme — Accent/theme selection
• externalEditor — Default external editor config
• shell — Default shell config
• hideWhitespaceInStorybook — Whitespace display setting

Implementation Requirements

• config_provider type plugin
• JSON config format, deep-merge into existing file
• Full protocol compliance (requestId, check_installed bare bool, settings from args, dryRun from args, no success/data fields)
• Atomic writes via tempfile.mkstemp + os.replace
• Empty stdin returns JSON error
• POSIX trailing newlines
• Test file with sys.path.append (not sys.path.insert(0))

Acceptance Criteria

• Plugin created under plugins/github-desktop/
• plugin.yaml, src/plugin.py, test/test_github_desktop.py included
• All tests pass
• Protocol compliant

[Stewartsson]

hi @DotDev262 can i work on this issue too

[DotDev262]

Assigned to @Stewartsson (eligible, #464 completed). Please commit to submitting a full feature in one PR — no partial/split submissions accepted.