fix(abi-emit-manifest): skip GADT-style data … where declarations

[hyperpolymath]

Summary

• iseriser abi-emit-manifest bombed with `data declaration has no `=`` on any Idris2 module containing a GADT — e.g. boj-server's vordr-mcp `MonotonicDegradation` proof relation.
• These are proof / relation types, not exported enums; the emitter now detects GADT form (`data Foo : … where …`) and skips them, the way it already walks past records/interfaces/functions.
• Two unit tests added (vordr-mcp shape + degenerate signature-only GADT). End-to-end verified against the real cartridge: emit exits 0 + abi-verify clean.

Refs

• Idris2 as source-of-truth: generate/verify Zig FFI from the ABI standards#92 — Phase 2 allowlist expansion (unblocks vordr-mcp)
• [#92 Class E] vordr-mcp: malformed Idris2 ABI source (data declaration has no =) boj-server#111 — the cartridge that motivated the fix

Test plan

• `cargo test --release` (lib + integration): 8 emitter tests + 9 integration tests pass
• Real-cartridge smoke: `iseriser abi-emit-manifest` against vordr-mcp's SafeVordr.idr now exits 0
• Real-cartridge follow-on: `iseriser abi-verify` on the emitted manifest exits 0 (clean)
• CI green on this PR
• Post-merge: `cargo build --release` consumers (boj-server abi-drift workflow) pick up the fixed binary

🤖 Generated with Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 19 issues detected

Severity	Count
🔴 Critical	2
🟠 High	5
🟡 Medium	12

⚠️ Action Required: Critical security issues found!

View findings

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    "reason": "Action actions/upload-artifact@v4 needs attention",
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    "reason": "codeql.yml lists `language: javascript-typescript` but the repo has no source files in any CodeQL-scannable language. The analyze job will exit 'no source files' on every run. Switch the matrix to `actions` (which scans workflow files — every repo has those).",
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  {
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    "file": "/home/runner/work/iseriser/iseriser/src/abi/zig_ffi_parser.rs",
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    "action": "flag",
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    "severity": "high"
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  {
    "reason": "expect() in hot path (14 occurrences, CWE-754)",
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    "file": "/home/runner/work/iseriser/iseriser/src/codegen/scaffold.rs",
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  {
    "reason": "expect() in hot path (11 occurrences, CWE-754)",
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    "file": "/home/runner/work/iseriser/iseriser/benches/iseriser_bench.rs",
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