feat(corpus): expand synthetic proofs for least-represented provers (#20)

Grow the per-prover corpora for the four provers with no public
downloadable training data (tiny communities, small libraries):

  Nuprl:   50 -> 152  (+102, +204%)
  Minlog:  46 -> 148  (+102, +221%)
  Imandra: 47 -> 133  (+86,  +183%)
  Twelf:   33 -> 118  (+85,  +258%)

New categories added to scripts/generate_synthetic_provers.jl:

  Nuprl:   sets, relations, number_theory, real_analysis, computability,
category_theory, topology, algebra, probability, bishop_analysis,
           proof_theory, information, quotient_types, w_types
Minlog: lists, trees, classical_logic, sequent_calculus,
induction_advanced,
higher_order, program_verification, modal_logic, intuitionistic,
           games, realizers_advanced, bounded_arithmetic, finite_logic
Twelf: binary_trees, substitution, session_types, linear_lf, metatheory,
polymorphism, modules, records, traces, bigstep, hoas, parsing,
           automata, effects, numerics
  Imandra: trees, numerics, records, state_machines, crypto, blockchain,
algebra, concurrency, databases, networking, security, ml_correctness

Regenerated proof_states_{nuprl,minlog,twelf,imandra}.jsonl match the
script.

https://claude.ai/code/session_0173ntsBsELMiXaTWvtjXdN8

Signed-off-by: Jonathan D.A. Jewell <6759885+hyperpolymath@users.noreply.github.com>
Co-authored-by: Claude <noreply@anthropic.com>

Author: hyperpolymath