Support static URL credentials and descriptor operations

[ctate]

Summary

• Keep ordinary records of stdout and stderr callbacks distinct from child process handles by checking member types.
• Add the static URL.password getter and canonicalize empty passwords in serialized URLs.
• Lower inline fs.constants.O_* numeric openSync flags through a target independent mask; add fstatSync, fchmodSync, fsyncSync, and linkSync for the C and LLVM backends.
• Add differential corpus cases, compatibility evidence, and documented Windows limits for no follow opens and descriptor chmod.

Validation

• pnpm -r build
• pnpm lint
• pnpm node-compat:check
• pnpm test:ts7 (146 passed)
• Focused C and LLVM differential corpus cases (6 passed)
• Project configuration and surface manifest tests (82 passed)
• Docs production build with webpack
• Local Darwin contracts and Vercel CLI suites in plain and sanitized lanes
• pnpm test:sandbox --lane plain --remote-only (8 shards, passed)
• pnpm test:sandbox --lane san --remote-only (8 shards, passed)

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Project	Deployment	Actions	Updated
scriptc	Ready	Preview, v0	Sep 23, 2026 4:05am UTC