doc: add error messages

[letypequividelespoubelles]

Note

Adds explicit error messages to numerous precondition checks, renames RIPEMD block counter helper, and performs small API/cleanup tweaks (e.g., computePcNew signature).

• Diagnostics / Assertions:
  • Add explicit messages to checkArgument/checkState across hub sections, precompile ops (BLS/EC/EXP), MMU/MXP/STP, txndata, utils, and runtime classes for clearer failures.
• Precompile Limits (RIPEMD):
  • Rename numberOfRipemd160locks -> numberOfRipemd160Blocks and update usages/tests (RipemdBlocks, RipTests).
• APIs / Cleanups:
  • Change CommonFragmentValues.computePcNew(...) signature (drop Hub param) and update callers.
  • Remove TraceSections.previousSection(); tighten previousSection(int) with a message.
  • Minor import and message wording tweaks (e.g., “temporarily update the target limb”, more specific module/tag prefixes).

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[amkCha]

Thank you for this PR 👍 I think the structure where the name of the module/instruction is in capital at the beginning is really helpful, it's there most of the time but not everywhere. The error messages should have the same format as well ( start with capital letters etc). I can go over it to unify it tmr if not done already 👌 I approved if you'd rather merge