Replace all TOML form definitions in examples/ and config/ with
type-checked Nickel equivalents. Update cli_loader to prefer .ncl
(via nickel export) over .toml in config search order.
TOML support retained as fallback — no breaking change.
- El loader usa nickel export --format json + serde_json como puente — evita reimplementar un parser Nickel en Rust y aprovecha el binario ya existente.
- El orden de búsqueda .ncl > .toml permite migración incremental: cualquier config vieja sigue funcionando sin tocarla.
- Los contratos Nickel (| default, | String) en los configs sustituyen la validación que antes era implícita en el parsing TOML — el error llega antes (en nickel export) con mensajes más descriptivos.
- Add resolve_constraints_in_content() to handle ${constraint.path} patterns
- Integrate into all form loading functions (load_from_file, load_fragment_form, etc)
- Support nested path navigation (e.g., constraints.tracker.udp.max_items)
- Add test_constraint_interpolation() test
fix(nickel-roundtrip): apply constraint interpolation in roundtrip workflow
- Fix execute_form() to use load_from_file() instead of parse_toml()
- Ensures constraints are resolved in roundtrip mode
docs(examples): add constraint interpolation example
- Create examples/05-fragments/constraints.toml
- Update examples/05-fragments/array-trackers.toml to use ${constraint.*}
- Document constraint workflow in examples/05-fragments/README.md
Benefits:
- Single source of truth for validation limits
- Forms auto-resolve constraints at load time
- All layers (Forms, Nickel, Templates) sync automatically
- Fix has_unique flag reading from field definition (was scanning fragment fields)
- Implement duplicate validation in CLI and TUI backends
- Add item counter update in Web backend after add/delete operations
- Refactor Web JavaScript: remove global constants, use closure-based state per group
- Store repeating group config in data-* attributes instead of global variables
- Update documentation and examples with unique = true attribute
- All backends now enforce unique items validation consistently
