📝 Refresh license year, backlog notes and JSDoc

Bump the copyright to 2026 in LICENSE and README, add the
comparison-section notes to the backlog, and trim the primitive-union
factory JSDoc now that the universe rules live in README § Caveats.

backlog.tasks

@@ -28,6 +28,8 @@ Documentation:
     → previous Examples order: literal/exhaustive, typeof, structural/discriminated unions, when, any
 ☐ Create `examples/` directory with runnable snippets
 ☐ Add comparison section vs. other TS pattern-matching libs in Readme.md
+    ☐ Why do we do this? => exhaustiveness encoded type safe
+    ☐ Why this form? little syntax, data last, very small, autocomplete, strict typing in the handler; for more features use ts-pattern
 ☐ Write migration guide for users coming from discriminated unions
 ☐ Create backlog tasks for implementation
 ☐ Validate code fences in Markdown (start with README.md) — compile the TypeScript examples against `src/` so the docs cannot drift from the API