feat(v7): Stat-Only Numerical Battle redefinition

Project direction simplified (per user final decision): V7 is now a stat-only
numerical battle game, not a skill-card game. Removed all mechanism-era V7
complexity (victoryPath, mechanic skeletons, six-action kits, generated statuses/
triggers/resources, reflect/control specializations, action-policy StrengthModel,
mechanism ranking/calibration gates, action solver). V1-V6 legacy untouched.

New stat-only V7:
* src/stat-battle-v7.js: one unified Basic Attack per living unit per round
  (initiative -> hit -> crit -> penetration -> DEF/RES -> barrier -> HP ->
  lifesteal/regen); deterministic canonical PRNG; no skill AI; draws converge.
* src/gen-v7.js: Level+Rarity -> TargetTheta -> budget; Seed -> normalized
  allocation weights; per-stat convex price curves + the allowed single
  global-scale power correction -> analytic iso-power per tier with distinct
  stat shapes (20 stats, bounds + diminishing returns).
* src/strength-model-v7.js: content-only analytic GeneralPower
  (effectiveDamage x survival x tempo x luck, geometric mean); never reads
  Level/Rarity/Seed/budget, never runs battles.
* src/battlepower-v4.js: BP = monotone display of GeneralPower (Lv50 A ~ 1000).
* Registered 4 new stats (HP_REGEN, RES_PEN, TOUGHNESS, CRIT_RES) in the
  parameter catalog and numerical-knowledge registry.

Measured (stat battles, 37,440 mirrored, 1,560 edges, 12 paired seeds):
Spearman(Target,Empirical)=0.9946, pairwise 0.99, same-tier p95-p5 0.14-1.25.
gate:v7-product 13/13 PASS; npm test 349/349; verify:release PASS.

V6 remains the product default: the anti-God-Stat breadth item (~5/15 stats with
clear +10% battle effect) and the final default switch stay open and are reported
honestly in docs/V7-DELIVERY-REPORT.md.

Author: NBL Agent

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