Generate Rust enum shells from spec enumerations

[lorisleiva]

This PR teaches the generator to emit Rust enum definitions from the spec's EnumerationSpec entries, replacing 9 previously hand-written enum shells with generated ones. The spec carries enumerations at the category level (today they all live under shared), so discovery is a simple walk over category.enumerations — no extra config and no additions to the override surface.

Each generated enum gets the standard derive set (Debug, PartialEq, Eq, Clone, Copy, Serialize, Deserialize) plus #[serde(rename_all = "camelCase")]. Variants are pascalCase(spec name) in declaration order, with enum-level and variant-level docs propagated from the spec. The generator deliberately does not emit #[derive(Default)]: the spec doesn't carry a "default variant" notion, so any required Default lives in a hand-written companion file alongside the generated shell — the same generated-type / hand-written-impls split already used for Number.

Reconciling the spec with the existing Rust crate required one breaking rename: Endianness::{Big, Little} → Endianness::{Be, Le}, since the generator derives variant names directly from the spec's [be, le] rather than carrying a per-enum override. The hand-written TryFrom impls still accept both the short and long forms as input. NumberFormat variant ordering also shifts from semantic to alphabetic (matching spec order); no match site relies on the old ordering. instruction_node.rs, instruction_status_node.rs, shared/bytes_encoding.rs, and the type_nodes/{number,pre_offset,post_offset}_type_node.rs files each lose their inline enum definition and keep only the bespoke impls (constructors, TryFrom, Default) the spec can't express; two new files in shared/ hold the Default impls for InstructionLifecycle and OptionalAccountStrategy so the per-type generated/hand-written symmetry stays clean.

Workspace-wide: 1006 cargo tests pass unchanged, fmt and clippy stay clean, pnpm test grew by 6 enumPage tests (113 → 119), and pnpm generate round-trips deterministically.

[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 👈 (View in Graphite)
• 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, 2:29 PM UTC: Graphite rebased this pull request as part of a merge.
• Jun 10, 2:29 PM UTC: @lorisleiva merged this pull request with Graphite.