T187: balanced reference coverage

balanced_generate.py is the standalone replacement entry point for the entire current selection. The earlier generate.py and its attachments remain unchanged as provenance for the retained subfamily; they do not enumerate the new additions.
    python -m pip install numberdb python-flint mpmath
    python balanced_generate.py
    python balanced_checks.py balanced-selection.json
Both commands default to offline checks and never submit, approve or publish.
Where critical arguments occur, also download the existing intrinsic_values.py; its exact hash is recorded and checked before importing it.

All pre-existing number strings, entry metadata, order of parameters and TID are retained. The old values have mixed-source provenance: this run rechecks them, but does not claim to have originally produced them. New numbers use 100 significant digits unless exact.
Selection roles and sources are in balanced-source-research.json and the completeness note. Exploratory reference cutoffs are explicitly noncanonical.