[SEED-2] Ring-2: Type declarations — enum/struct gen to Zig

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Ring-2: Type Declarations → Zig

Ghuloum step: #3 (unary prims — single-thing operations)
One capability: t27c gen outputs valid Zig enum/struct declarations
Depends on: Ring-1 (#3)

Acceptance Test

./bootstrap/target/release/t27c gen tests/ring0_trivial.t27 > /tmp/test.zig
grep -q "const ONE: i8 = 1;" /tmp/test.zig && echo "PASS" || echo "FAIL"

Scope

• Zig codegen for const declarations (all literal forms)
• Zig codegen for enum declarations
• Zig codegen for struct declarations
• Generated Zig header comment with phi^2 + 1/phi^2 = 3

phi^2 + 1/phi^2 = 3 | TRINITY

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🟢 Ring-2 started: Type declarations → Zig codegen
Branch: ring/2-type-decl-gen

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⚙️ Progress: Codegen outputs 5 const declarations for ring0_trivial.t27, 15 consts + 1 enum (Trit) + 1 struct (UnpackResult) + 35 fn stubs for types.t27

All 29 .t27 files parse and generate without errors.

Key fixes:

• Enum variant values now emitted correctly (neg = -1, zero = 0, pos = 1)
• Struct fields parsed and emitted with types
• Array type aliases handled ([WORD_BYTES]u8)
• Function stubs include @CompileError("not yet implemented")
• Header includes module name and phi signature

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🔗 PR opened: #10

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🎉 Ring-2 MERGED: Type declarations → Zig codegen complete

t27c gen now outputs valid Zig for:

• ✅ 5 const declarations (ring0_trivial.t27)
• ✅ 15 consts + 1 enum + 1 struct + 35 fn stubs (types.t27)
• ✅ All 29 .t27 files parse and generate without errors
• ✅ No regressions in ring-0 or ring-1