Generate Rust type nodes

[lorisleiva]

This PR generates 21 of the 28 type-category nodes from @codama/spec, completing first-class generation support for all 8 spec categories. The 7 nestable wrappers (fixedSize, sizePrefix, pre/postOffset, sentinel, hiddenPrefix/Suffix) and the four type-category unions stay hand-written, since they carry generic variant types, a cross-category Link member, and bespoke TryFrom bridges that don't fit the standard renderers — and they're the natural deletion boundary if a future spec drops nested unions.

The generator gains a NodeMacroFlavor classifier (nodeFlavor.ts) that picks the emission macro per node from the spec: nestedTypeNode.wrappers are skipped, enumVariantTypeNode members and structFieldTypeNode get #[node], and other type nodes get #[type_node]. CategoryRouting gains an emitUnions flag so type skips its bespoke unions, and struct joins the Rust keyword set so enumStructVariantTypeNode.struct renders as r#struct.

Reconciliation is mostly contained to codama-nodes/src/type_nodes/. Spec-driven type changes: amountTypeNode.decimals → u32, the enum-variant discriminator → Option<u32>, and optionTypeNode.fixed → Option<bool>. The box-all-union rule boxes array/map/set.count → Box<CountNode> and structFieldTypeNode.{type, default_value}, which cascades into a few codama-attributes/codama-koroks/codama-korok-visitors files and their tests. The hand-written nestable nodes are left untouched.

1008 cargo tests pass unchanged; pnpm test grew by 8 to 148; fmt, clippy, and the pnpm generate round-trip stay clean. The override surface is unchanged.

[lorisleiva]

• spec-generators: map float to crate::Number; remove FIELD_TYPE_OVERRIDES #104
• Generate Rust type nodes #103 👈 (View in Graphite)
• Generate Rust topLevel nodes (account, constant, error, event, instruction*, pda, program, root, …) #102
• Generate Rust enum shells from spec literalUnions #101
• Generate Rust enum shells from spec enumerations #100
• Generate contextualValue nodes; align Rust variant names with the derived rule #99
• Generate RegisteredNodes category unions; remove HAND_WRITTEN_UNIONS #98
• Derive inline-union allowlist from the spec; remove INLINE_UNIONS #97
• Rename Rust types to match spec; remove UNION_NAME_OVERRIDES + ENUMERATION_NAME_OVERRIDES #96
• Generate value nodes; introduce field-type override + hand-written-union skip #95
• Add inline-union support and complete pdaSeed generation #94
• Generate count and discriminator nodes #93
• Add JS spec generator for codama-nodes link nodes #92
• main

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[lorisleiva]

Merge activity

• Jun 10, 2:13 PM UTC: A user started a stack merge that includes this pull request via Graphite.
• Jun 10, 2:35 PM UTC: Graphite rebased this pull request as part of a merge.
• Jun 10, 2:35 PM UTC: @lorisleiva merged this pull request with Graphite.