Generate count and discriminator nodes

[lorisleiva]

This PR extends the spec generator to cover two more node categories \u2014 count and discriminator \u2014 landing six generated structs and two union enums under codama-nodes/src/generated/. Hand-written <category>/<node>.rs files shrink to constructors and #[cfg(test)] mod tests, mirroring the PR #1 treatment of link nodes. Integer fields backed by spec integer/u64 (the value, offset, and size attributes) become u64 for determinism; the change propagates through the four constructors, the ArrayTypeNode/SetTypeNode/MapTypeNode .fixed() helpers, the discriminator_directive's SetOnces, and the identify_field_types_visitor's array-length parsing, all of which now flow u64 end to end. The generator gains a small heuristic that derives Copy when every attribute is a scalar (integer / float / boolean / enumeration) and Default when the struct is empty, eliminating per-node configuration. getEmittableUnions now requires a registered<Name> sibling, which keeps the category-main unions and skips inline / synthetic ones. A separately-fixed bug: optional docs attributes were being wrapped in Option<Docs>; they are now emitted as bare Docs regardless of the spec's optional flag, matching the established convention. pdaSeed is intentionally left out of this PR \u2014 its constantPdaSeedNode.value references a nested inline union (constantPdaSeedValue) that requires the non-flattening union machinery planned for a later PR.

[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
• Add inline-union support and complete pdaSeed generation #94
• Generate count and discriminator nodes #93 👈 (View in Graphite)
• 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, 2:15 PM UTC: Graphite rebased this pull request as part of a merge.
• Jun 10, 2:15 PM UTC: @lorisleiva merged this pull request with Graphite.