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

.config/dot/.claude/tasks/0000-nested-subcommand-discovery.md

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+---
+spec: dot-kde
+---
+
+## What to build
+
+Extend the subcommand-discovery mechanism to glob one directory level
+deeper, so a `dot` subcommand can live as `commands/<name>/<name>.fish`
+alongside a companion file (e.g. a Python helper), not just as a flat
+`commands/<name>.fish`. This mechanism exists in two places today
+(`dot.fish`'s `__dot_help` and `completions/dot.fish`'s
+`__dot_custom_subcommands`), intentionally duplicated rather than shared
+(fish autoload constraints) — both must be updated together and stay in
+sync. Existing flat-file subcommands must keep working unchanged.
+
+This is pure prefactoring: no KDE-specific behavior is introduced here.
+
+## Acceptance criteria
+
+- [ ] `dot help` lists a subcommand that lives at `commands/<name>/<name>.fish`
+- [ ] `dot <name>` sources and dispatches to `commands/<name>/<name>.fish`'s `_dot_<name>` function
+- [ ] Tab-completion (`__dot_custom_subcommands`) lists a nested-directory subcommand
+- [ ] Existing flat-file subcommands (`dot install`) are still discovered and dispatched correctly
+- [ ] `tests/dot.fish` covers a nested-directory dummy command dispatching correctly, alongside the existing flat-file dispatch case