Add BAST document parser (typed tree, step 3)

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- New src/bast.rs: typed surface over a BAST document — BastDoc,
  BastDef, BastDefKind, BastStruct, BastField, BastUnion,
  BastDiscriminator, BastEnum, BastType, BastRef, BastArray,
  BastRecord. Borrows from the source Value (no clone of the tree).
- $ref resolution is a single hash lookup against $defs
  (#/$defs/<name> only); union variant refs resolved lazily via
  BastDoc::resolve_typeref / resolve_ref — replaces
  normalize_refs + inline_union_variant_refs (those stay for now;
  step 8 removes them).
- Untrusted-input safe: every walk returns AlkTypeError::Schema on
  a malformed document, never panic/unwrap (AGENTS.md §3).
  Overflow-safe usize parsing via try_from (AGENTS.md §4).
- D-BAST-005 enforced: fields array only valid with field-name
  discriminators; required for them.
- Additive only: new pub mod bast + re-exports in lib.rs. No
  existing re-exports removed (those go in step 8). 47 new tests.

Verification:
- cargo test --release: 465 pass (379 lib + 86 integration)
- cargo clippy --all-targets -- -D warnings: clean
- cargo doc --no-deps: clean
- cargo build --target wasm32-unknown-unknown --release: clean

...

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glm-5.2 committed 2026-08-15 11:56:03 +00:00

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