Generate value nodes; introduce field-type override + hand-written-union skip

[lorisleiva]

This PR brings the value category into the generator: 16 node structs are emitted under codama-nodes/src/generated/value_nodes/, plus the renamed EnumVariantData inline union (enumValuePayload in the spec). Hand-written value_nodes/*.rs files shrink to constructors and #[cfg(test)] mod tests, mirroring the established pattern. Three pieces of generator infrastructure land alongside, each driven by a one-entry config that future PRs can extend or simplify: HAND_WRITTEN_UNIONS skips category unions whose Rust counterpart can't be reproduced mechanically (currently the value category's valueNode, hosted as the hand-written RegisteredValueNode with #[derive(RegisteredNodes)]); FIELD_TYPE_OVERRIDES pins a specific (node, attr) pair to a bespoke Rust type when the spec can't capture it (currently numberValueNode.number \u2192 Number, since the spec says float(f64) but Rust uses a Number enum with a serde(from/into = "JsonNumber") adapter and eight From<uN/iN/fN> impls \u2014 all kept hand-written in number_value_node.rs); and UNION_NAME_OVERRIDES gains an entry for enumValuePayload \u2192 EnumVariantData. The inline-union emit path also now uses the Rust override name (when present) for the on-disk file name, so enumValuePayload lands at enum_variant_data.rs matching its type name. The enum Rust keyword is added to the field-name escape set (enumValueNode.enum \u2192 r#enum). Box rule applies: constantValueNode.{type,value}, mapEntryValueNode.{key,value}, someValueNode.value, structFieldValueNode.value, and enumValueNode.value (as Box<Option<EnumVariantData>>) are all boxed; the corresponding hand-written constructors use Box::new(...) and tests dereference with *.

[lorisleiva]

• spec-generators: map float to crate::Number; remove FIELD_TYPE_OVERRIDES #104
• Generate Rust type nodes #103
• 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 👈 (View in Graphite)
• 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, 2:19 PM UTC: Graphite rebased this pull request as part of a merge.
• Jun 10, 2:19 PM UTC: @lorisleiva merged this pull request with Graphite.