Fix private alias precompilation

[cyphercodes]

Fixes #1362.

Summary

• Rebind precompiled traversal functions for nodes owned by a scope when the scope is exported, so aliases that were compiled during cyclic scope resolution do not keep stale references to unresolved context ids.
• Add a regression test for a cyclic discriminated union that references a private alias.

Tests

• pnpm exec mocha --no-config --no-package --node-option conditions=ark-ts --node-option import=tsx --require ./ark/repo/mocha.globalSetup.ts ark/type/__tests__/realWorld.test.ts --skipTypes
• pnpm exec mocha --no-config --no-package --node-option conditions=ark-ts --node-option import=tsx --require ./ark/repo/mocha.globalSetup.ts ark/type/__tests__/scope.test.ts ark/type/__tests__/discrimination.test.ts --skipTypes
• NODE_OPTIONS=--max-old-space-size=4096 pnpm typecheckRepo
• pnpm exec prettier --check ark/schema/scope.ts ark/type/__tests__/realWorld.test.ts

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