test(idris2): port DSL + playground test suites from Racket/TS

[hyperpolymath]

Summary

Estate ports 5a/11 (DSL) + 5b/11 (playground) — converts the betlang test surface to Idris2 under the cladistic `Test.Spec` harness used by ipfs-overlay, format-registrations, awesome-nickel, etc.

Originally tagged DEFERRED ("multi-week language reimpl") in the estate bimodal-rollout — pragmatic re-scoping landed it as the same content-validation + pure-logic shape that the other estate ports use, no Racket runtime required.

What ported

`tests/idris2/` (DSL — content-validation)

• DslStructureTest — 16 unit tests: file existence, `#lang racket` declarations, SPDX coverage, primitive provides, structural substring checks across the 8 `.rkt` source files
• DslContractsTest — 12 INVARIANT tests pinning documented contracts (ternary shape, weighted-3 enforcement, seed reproducibility, entropy bounds, 25-test `basics.rkt` coverage, `bet-parallel` list-comprehension form)

`playground/tests/idris2/` (hybrid: pure-logic + content-validation)

• PlaygroundTernaryTest — 13 tests; inline Idris2 reimplementation of the Kleene 3-value logic (`Tri/notT/andT/orT/impliesT/betT`). De Morgan + commutativity property checks over all 9 `Tri` pairs.
• PlaygroundProbabilityTest — 12 tests; pure-logic port of `Branch/betWeighted/betConditional/analyticEV`. mulberry32 PRNG falls back to content-validation.
• PlaygroundStructureTest — 14 tests; SPDX + structural checks across the 4 `.ts` files and `deno.json`.

Totals

67 / 67 tests PASS on idris2 0.8.0:

• DSL: 28 / 28 PASS
• Playground: 39 / 39 PASS

SPDX coverage note

Only the 2 `conformance/*.rkt` files carry SPDX headers. `DslStructureTest` pins current truth (asserts those two specifically) rather than failing on absent headers across the other 6 files. Backfilling SPDX across `core/` + `lib/` + `tests/basics.rkt` is tracked separately in the estate licence-debt ledger.

Test plan

• Local: `idris2 --build betlang-tests.ipkg` clean compile, 28 PASS
• Local: `cd playground && idris2 --build playground-tests.ipkg` clean compile, 39 PASS
• CI: dogfood-gate workflow picks up the new ipkg files

🤖 Generated with Claude Code

[github-actions]

🔍 Hypatia Security Scan

Findings: 56 issues detected

Severity	Count
🔴 Critical	9
🟠 High	18
🟡 Medium	29

⚠️ Action Required: Critical security issues found!

View findings

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