fix(typecheck): generalize parametric enum ctor schemes (import path) (#128)

[hyperpolymath]

Root cause of the result.affine import-path Unify ((_->_), T): register_type_decl's TyEnum branch built result_ty tyvars with anonymous fresh_tyvar 0 and never bound the declared param names. So field types and the result type used disconnected tyvars, and generalize was a no-op at level 0 — leaving imported parametric ctor schemes (prelude Ok/Err/Some) monomorphic with shared vars, collapsing payload types across use-sites.

Fix: bind param names to fresh tyvars one level deeper so result+field types share them; generalize at the outer level; scope param names so they don't leak into sibling type decls.

• stdlib 14 → 15/19 (result.affine now green)
• dune test 233/233, zero regression
• Complements fix(typecheck): instantiate constructor schemes per use-site in patterns (#128) #187 (builtin-path fix); this is the import-path counterpart

Refs #128

[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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