docs: Add specs and tasks for previously scoped work in todo.md

.config/dot/.claude/tasks/0002-kde-schema-backed-apply.md

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+---
+spec: dot-kde
+blocked-by: 0001-kde-schema-backed-save
+---
+
+## What to build
+
+Implement `dot kde apply` for schema-backed settings: read every entry in
+the manifest and write its declared value onto the live system via
+`kwriteconfig6`. Re-running it against an already-applied system must be a
+no-op with no unintended side effects — this is the idempotence the
+feature depends on for safe re-runs after a KDE update or on a freshly
+built machine. Add `dot kde apply help`, following the project's
+check-for-`help`-before-`argparse` convention.
+
+Add a README row for `dot kde apply`.
+
+## Acceptance criteria
+
+- [ ] `dot kde apply` pushes every manifest entry's declared value onto the live system via `kwriteconfig6`
+- [ ] Re-running `dot kde apply` against a system already matching the manifest changes nothing (idempotent)
+- [ ] `dot kde apply help` prints usage without writing anything
+- [ ] Tests run against a scratch `$HOME`, exercising apply over a manifest with schema-backed entries, verifying resulting rc-file contents and idempotence on a second run
+- [ ] README has a row for `dot kde apply`