Adds `gen tuned` to cmd/open5e-import: a deterministic formula that scales
every raw SRD stat block down to an engine-ready DnDMonsterTemplate. HP/AC/
AttackBonus are verbatim SRD (AC clamped to the engine min 10); the Attack
stat is interpolated from attackByCRPoints, a CR→Attack anchor table lifted
from the hand-tuned dndBestiary (CR is the calibration axis the 2026-05-10
rebalance used — raw SRD per-hit damage is ignored). Speed/BlockRate are
coarse baselines from SpeedWalk/AC.
bestiary_tuned.go merges the 322 generated templates into dndBestiary, but
hand-authored roster entries win — the merge only fills IDs the roster does
not already define, so playtested numbers and wired abilities are untouched.
Abilities are deliberately not wired: every generated entry has a nil
Ability, with the SRD multiattack/trait text parked in Notes as raw material
for the follow-up ability-wiring pass.
