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feat(lang): a name is defined once, a local once per block, and a result is always returned

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L1. Two vars, consts, enums, properties or events of one name in a program are an error naming
both places (functions already were); the first used to win silently. A let / var of a name its
own block already declared is an error (it used to shadow). A function with a result type whose
body can reach its end without a return is an error, asked structurally of the body - a return,
an if/else or a match with a default arm whose every branch ends - rather than handing back
whatever the result slot held. The game, the lab and every package example pass all three;
the lab had one harmless shadow, and the game's split screens had two real bugs of the kind.
examples/rejected/ holds the four refusals, checked by the test runner's new reject_case.
Seed regenerated.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Orkun ÇAKILKAYA 2026-09-23 23:55:20 +03:00
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@ -62,6 +62,14 @@ parse:
chronorift/world.ludic:1: error: expected expression
```
All of a program's files share one namespace, so **a name is defined once**: two functions, two
`var`s or `const`s (or an `enum` and a `const`), or two `property` / `event` records with one name
are an error that names both places. Declarations the runtime splices in are its own and are not
checked against each other.
The same holds inside a function: a `let` or `var` declares its name once per block (another
block, a loop variable or a parameter may reuse it), and a function with a result type must
`return` one on every path - running off the end of its body is an error, not a zero.
## Models (entity kinds)
An `model` names a *kind* of entity and the fixed set of properties it