errors: catalog grows from 259 → 702 patterns

Adds 443 new ErrorPattern entries:
  - 34 arity patterns for the new LLM-facing builtins (canonical,
    code_intel, session-memory, tokenizer introspection)
  - 38 hand-written entries for runtime errors not previously
    catalogued: math overflow / NaN / infinity, borrow conflicts,
    UTF-8 issues, file/network I/O failures, recursion limits,
    parser errors (RBrace, RParen, RBracket, Colon, EOF, etc.),
    type-coercion failures, lambda capture issues, generator-
    misuse, module-import failures, autograd tape misuse,
    hash collisions, regex compile, format mismatches, OOM,
    substrate range, Singularity values.
  - 371 generic "name: " patterns covering every interpreter builtin
    so non-arity errors from any builtin still match the catalog
    (the entry points back to omc_help for the right signature).

Coverage: every builtin in the interpreter now has at least two
distinct error patterns (arity + generic) in the knowledge base.
The omc_explain_error builtin's matched-pattern rate goes way up.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: RandomCoder-lab