Add static union receiver calls

[ctate]

Summary

• dispatch same-ABI class methods and checked-dynamic callable fields across union receiver arms
• compile map and forEach on array unions without copying receivers, preserving holes, mutation timing, callback identity, and evaluation order
• fix numeric array in checks to query real slot presence and raise the Commander static floor to 1,200 statements with 56 or fewer deferred fences
• add Node-differential corpus coverage, TS 7 live-parity coverage, baselines, and limitations documentation

Validation

• pnpm --filter @scriptc/compiler build
• pnpm exec eslint packages/compiler/src/frontend/lowering/lower-calls.ts packages/compiler/src/frontend/lowering/lower-containers.ts packages/compiler/src/frontend/lowering/lower-exprs.ts packages/compiler/src/frontend/lowering/lowerer.ts
• focused differential corpus for 2930/2931
• focused Commander npm-static acceptance
• pnpm test:ts7 (143 tests; 1,403-entry full sweep)
• pnpm node-compat:check
• NEXT_DIST_DIR=.next-check pnpm check in docs/
• pnpm test:sandbox (plain + sanitized lanes passed in 11.2 minutes)

[vercel]

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Project	Deployment	Actions	Updated
scriptc	Ready	Preview, v0	Sep 20, 2026 3:02pm UTC