Add static fixed-tuple call spreads

[ctate]

Summary

• flatten non-empty fixed tuple spreads into fixed call signatures while preserving left-to-right, evaluate-once semantics
• apply the same completion to direct functions, overload aliases, generics, methods, constructors, typed rest parameters, and table-backed builtin aliases with defaults
• update the generated compiler surface, limitations documentation, diagnostics snapshots, and TS 7 parity baseline

Validation

• pnpm -r build
• pnpm lint
• pnpm node-compat:check
• pnpm test:ts7
• docs: NEXT_DIST_DIR=.next-check pnpm check
• focused C and LLVM differential tests for corpus 2914
• pnpm test:sandbox: plain and sanitized lanes passed across all Linux shards and Darwin-native contracts

[vercel]

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Project	Deployment	Actions	Updated
scriptc	Ready	Preview, v0	Sep 19, 2026 4:27am UTC