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

.config/dot/.claude/tasks/0004-kde-freeform-mechanism.md

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+---
+spec: dot-kde
+blocked-by: [0002-kde-schema-backed-apply, 0003-kde-schema-backed-diff]
+---
+
+## What to build
+
+Add the freeform mechanism as a dispatch branch across `save`, `apply`,
+and `diff`: for settings with no KConfigXT schema (e.g. `kxkbrc`'s
+`Options=` line), read and write via `kreadconfig6`/`kwriteconfig6`, with
+"default" defined as "the key is absent" rather than any schema-declared
+value. In the identifier-resolution decision from the first schema-backed
+task, this is the fallback branch: an identifier whose `(rcfile, group,
+key)` doesn't resolve through the mapping table is freeform. Because
+there's no schema to enumerate, freeform settings can only be checked by
+`diff` when already declared in the manifest — they never participate in
+undeclared broad-scan discovery.
+
+As the real-world validation for this task, bring the machine's live,
+already-hand-set `kxkbrc` caps-lock/Escape swap
+(`Options=caps:escape_shifted_capslock`) under tracking via
+`dot kde save`, and confirm `dot kde apply`/`dot kde diff` behave
+correctly against it.
+
+## Acceptance criteria
+
+- [ ] An identifier whose `(rcfile, group, key)` has no schema match is treated as freeform rather than erroring
+- [ ] `dot kde save <identifier>` and `dot kde save` (refresh) work for freeform entries
+- [ ] `dot kde apply` writes freeform entries via `kwriteconfig6`, idempotently
+- [ ] `dot kde diff` reports a freeform mismatch when its identifier is already declared in the manifest, and never surfaces an undeclared freeform setting via broad scan
+- [ ] Tests run against a scratch `$HOME`, covering freeform save/apply/diff using a fixture rc file with no corresponding schema
+- [ ] The live `kxkbrc` caps-lock/Escape swap is tracked via `dot kde save` and the manifest committed to the dotfiles repo