dotfiles/.config/dot/.claude/tasks/0003-kde-schema-backed-diff.md

spec, blocked-by

spec	blocked-by
dot-kde	0001-kde-schema-backed-save

What to build

Implement dot kde diff's broad, read-only scan for schema-backed settings: walk every (rcfile, group, key) reachable through the mapping table built in the prior task, compare each live value (kreadconfig6) against its schema-declared default, and report every mismatch. Each reported mismatch is tagged as declared (its identifier is present in the manifest — an intentional, already-tracked deviation) or undeclared (never explicitly declared). diff never writes anything. Add dot kde diff help, following the project's check-for-help-before-argparse convention.

Add a README row for dot kde diff.

Acceptance criteria

• dot kde diff reports every schema-backed setting whose live value differs from its schema-declared default
• Each reported mismatch is tagged declared or undeclared based on manifest presence
• dot kde diff makes no writes under any circumstances
• dot kde diff help prints usage without scanning
• Tests run against a scratch $HOME and fixture .kcfg schema directory, covering: a declared mismatch, an undeclared mismatch, and a setting matching its default (not reported)
• README has a row for dot kde diff