Three substrate moves required by the Blazr-session port that surfaced
real cross-backend divergences:
1. Inline-substitution for primitive aliases and string enums. Named
types whose body is `Alias(Primitive(_))` or `Enum(_)` collapse into
their inline TypeShape at every `Ref` use site, and don't emit as
their own `type "X" { ... }` entry. Matches Python's Pydantic Literal
and `Foo = str` alias inlining — codegen consumers see the primitive
directly rather than chasing a single-hop indirection.
2. Reachability tree-shake on the type registry. `#[derive(Mizan)]` now
auto-registers every Mizan type into the TYPES slice; the emitter
then transitively walks Refs from function inputs/outputs and emits
only the reachable subset. Original-named entries from derive
register only when something refs them; canonical-renamed entries
from the function macro are reachable by definition. Mirrors
Python's `_collect_named_types`.
3. `#[serde(rename_all = "...")]` + `#[serde(rename = "...")]`
propagation in `#[derive(Mizan)]` for enums. IR enum variants now
match the on-wire JSON casing (lowercase / snake_case / kebab-case /
etc.), not the Rust variant idents. Supports all serde casings.
AFI codegen + wire parity stays green after these changes (the AFI
fixture's enum-free + Pydantic-shape types are unchanged by the three
substrate extensions).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Ryth Azhur
54f060c273