* ⚡ Improve performance and fix orphan detection in validate-file
- Add `*ref-shape-cache*` dynamic var to memoize `find-ref-shape`
lookups per page, avoiding repeated O(depth) ancestor walks.
- Add `*children-sets*` pre-computed maps for O(1) parent-child
containment checks, replacing linear `some` scans.
- Short-circuit `inside-component-main?` when the shape context
already implies a main component.
- Use single-pass reduce with early exit for duplicate detection
(children, swap slots) instead of count/distinct or frequencies.
- Guard `check-missing-slot` to skip expensive `find-near-match`
when the shape already has a swap slot.
- Refactor variant-set validation to use `run!` with direct `get`.
- Refactor `check-ref-cycles` to use a single `reduce-kv` pass.
- Fix `get-orphan-shapes`: the original `map` pipeline produced
nils so orphan shapes were never validated; rewrite with
`reduce-kv` for correct results.
- Add `validate-file-affected!` for change-scoped validation,
replacing full file validation in `process-changes-and-validate`
to only validate pages and components touched by the changes.
Signed-off-by: Andrey Antukh <niwi@niwi.nz>
* ✨ Improved validation
---------
Signed-off-by: Andrey Antukh <niwi@niwi.nz>
Co-authored-by: alonso.torres <alonso.torres@kaleidos.net>
