Add static callable specialization

[ctate]

Summary

• add symbol-keyed static callable projections so immutable aliases of overloaded declarations retain TS 7 overload selection and original function identity
• route immutable Node builtin aliases and util.promisify projections for child_process.execFile and UTF-8 fs.readFile through existing static lowerings while keeping escaping values fenced
• implement callback child_process.execFile capture and error delivery in the C and LLVM backends and the cross-platform runtime
• add differential corpus coverage, Node-types coverage, diagnostics, compatibility inventory updates, and limitations documentation

Validation

• pnpm -r build
• pnpm lint: 0 errors; warning-only repository baseline
• pnpm test:ts7: 142/142
• diagnostics: 123/123
• project config: 16/16
• pnpm node-compat:check
• docs check
• focused ordinary and sanitized C/LLVM coverage for corpus 2595 and 2910-2913
• full ordinary and sanitized C corpus: 1,194/1,194 in both lanes
• full ordinary LLVM corpus: 1,194/1,194
• sanitized LLVM corpus: 1,193/1,194 in the aggregate; 1839-var-js passed in isolation under sanitizers
• local plain suite: 4,287 passed with one stale WASI runtime-pack hash; the runtime pack was rebuilt and its focused smoke passed
• local sanitized suite: 4,285 passed with three aggregate contention timeouts; all three passed in isolation under sanitizers
• pnpm test:sandbox was attempted twice; the Vercel event streams ended with status 125, while all completed shards were green

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Project	Deployment	Actions	Updated
scriptc	Ready	Preview, v0	Sep 18, 2026 7:41pm UTC