2026 02 18 audit

[thedavidmeister]

Motivation

Solution

Checks

By submitting this for review, I'm confirming I've done the following:

• made this PR as small as possible
• unit-tested any new functionality
• linked any relevant issues or PRs
• included screenshots (if this involves a front-end change)

Summary by CodeRabbit

• Bug Fixes

  • Improved robustness for many parsing, evaluation, boundary and overflow edge cases with clearer error coverage.

• Tests

  • Added extensive parameterized and fuzzed tests covering parsing, bytecode building, integrity/highwater, multi-source evaluation, namespace isolation, evaluator truncation, and many edge cases.

• Documentation

  • Added TESTING.md with testing conventions and expanded triage/process guidance (stricter verification before marking findings fixed) and clarifying notes across docs.