feat(effects): thread parametric Throws[E] type argument (Refs #59)

[hyperpolymath]

STAGE-B cleanup — parametric Throws[E]

lower_effect_expr dropped EffCon type args, so Throws[MyErr] collapsed to bare Throws — the type parameter the #59 v1 list specifies (Throws[E]) was invisible in the effect representation.

Change

EffCon args are now mangled into the effect singleton: Throws[MyErr] → ESingleton "Throws[MyErr]", distinct from Throws[Other] and bare Throws under eff's string-equality unification.

Chosen over adding a parametric variant to the eff ADT — that would ripple across every effect operation in effect.ml/unify.ml, disproportionate for a cleanup. The base name is still validated through the v1 registry.

Scope (honest)

This is effect tracking only. AffineScript does not currently enforce effect-annotation subsumption at call sites — verified: even IO body vs Mut decl, or pure body vs IO decl, pass today. Strict effect checking / handler semantics are the separately-deferred work (migration-stance guide; #59: "tracking alone gives most of the value"). This PR makes the tracked form carry E; it deliberately does not add enforcement.

Verification

• dune build clean; dune test --force 253/253, zero regression.
• Bogus[Int] still rejected → the parametric path runs and base-name validation works.
• Throws[Int] lowers distinctly from Throws[String] / bare Throws by construction.

Refs #59

[github-actions]

🔍 Hypatia Security Scan

Findings: 44 issues detected

Severity	Count
🔴 Critical	12
🟠 High	21
🟡 Medium	11

⚠️ Action Required: Critical security issues found!

View findings

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