test: add frozen recognition challenge

[akcorca]

Closes #178

Outcome

• Add a strict, frozen 24-case synthetic holdout independent from generated law/diversity fixtures.
• Cover all six owned layers (syntax, binding, constraint, pack, resolution, presentation), all eight quality metrics, and positive/refusal outcomes for every layer.
• Parse untrusted fixture JSON through one exact schema and score each dimension separately with pure functions.
• Extract one shared native semantic-evaluation adapter instead of duplicating foundation process/I/O code.
• Keep actual challenge execution manual while validating its schema and coverage matrix in fast unit tests.

Baseline

22/24 cases pass. The two preserved failures are actionable inputs to later ordered children rather than fixture edits:

• generic prose does not yet classify natural Events C and D ... coordination (v0.18 5/5: Promote existing mixed packs through shared primitives #181);
• an integral command does not yet produce a cursor-addressable binder occurrence (v0.18 4/5: Complete shared calculus, indexed-family, and operator semantics #180).

The strict bun run challenge gate will turn green before parent #176 closes; challenge:baseline writes the current attributed report without weakening that final gate.

Verification

• bun run check
• bun run foundation (118/118 after runner extraction)
• bun run challenge:baseline (22/24, exactly two attributed gaps)
• awiki lint -r

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