[ITSGJY]

Summary

• Enforce portable JSON parsing limits of 256 nested containers and 4,300 integer digits for offline Agent Loop tooling, independently of Python interpreter recursion behavior.
• Reuse one bounded decoder for case manifests, benchmark driver receipts, and Host Timing reports, preserving existing file-handling and schema-validation contracts.
• Cover malformed deep JSON, oversized integers, quoted structural characters, and valid in-bound inputs with focused regressions.

Verification

• Targeted boundary tests and Python input integration tests passed.
• Fork CI for exact commit b564ad41: 11 successful checks, 7 conditional skips, 0 failures.
• The patch contains five Python tooling files.