docs: refine 40 more stub entries (substrate / python / autograd / stdlib / tests)

Hand-tuned descriptions + signatures for:

  substrate (28 of them, marked unique_to_omc): attractor_bucket,
    crt_residues, harmonic_anomaly_score, harmonic_dedupe,
    harmonic_diff, harmonic_hash, harmonic_partition,
    harmonic_read_file, harmonic_score, harmonic_sort,
    harmonic_split, phi_disk_*, phi_fold, phi_res, phi_shadow,
    phi_pi_fib_log, phi_pi_fib_search, largest_attractor_at_most,
    him, him_score, hbit_band, hbit_dual, is_singularity,
    zeckendorf_decompose, zeckendorf_weight

  python embedding: 29 py_* (import, call, get, set, eval, exec,
    callback, register, hasattr, getattr, etc.)

  test_runner: test_record_failure, test_failure_count, test_clear,
    test_get_failures, test_set_current, test_current_name

  stdlib: csv_parse, read_file, write_file, file_exists, fetch_url,
    env_get/set, format_float, random_float/int/seed/choice/shuffle,
    sleep_ms, panic, error, assert, defined_functions, stack_depth,
    stack_trace, caller_name, current_function, is_defined,
    cleanup_array

  autograd: tape_div, tape_pow_int, tape_neg, tape_exp, tape_sin,
    tape_cos

  duals: dual_sub, dual_div, dual_neg, dual_pow_int, dual_exp,
    dual_sin, dual_cos, dual_relu, dual_sigmoid, dual_tanh, dual_v

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

Author: RandomCoder-lab