[Roxas2712]

API-3/unified mods can now assign canonical move-effect IDs on Gen1–3, with validation against the host's actual battle handlers before journaling. Split Special Attack/Defense effects use the appropriate native stages. Gen2/3 also expose secondaryChance in whole percent, convert explicit odds to native fractions, and distinguish explicit 0% from a legacy zero byte's fallback behavior.

Depends on #120 and its prerequisites; merge that first. Focused review: https://github.com/Roxas2712/Gen2Recomped/compare/5528ea28a9e8f9451aa27bbc6f2d411fa8ef2e62...1d9b8ef0ae11e8faa791da895d9b3d305da1be4e

A reproducible, data-only catalog records 211 reference effect IDs from pinned Gen1Recomp maps and the host importer's native-name map, with provenance hashes. Runtime handler checks still refuse missing mechanics. Eight unimplemented Gen3 handlers remain unavailable; opaque native selectors roundtrip only with their original record, and Gen4/5 effect changes remain unavailable. Registered custom native effects keep their IDs. Unmodified detached records preserve exact native odds.

Validation:

• 856 focused assertions, including hundreds of binding checks, actual native stage/status callbacks, zero/boundary odds, alias identity, atomic refusal and exact native-byte roundtrips.
• Existing unified-content regression: 391/391.
• Generator --check passes against the clean pinned reference.
• 176 cross-engine comparisons / 352 isolated runs at clean feature and combined integration heads.
• Feature 95/105 engine suites; integration 100/110. Exact baseline 17 failed assertions + 10 failed suites unchanged; SDK 3/3 and B30 pass.
• Diff checks and formatting of new hand-written modules pass; legacy file encoding preserved.

This selects existing native behavior; it does not add missing mechanics or claim imported-ROM, RNG or pixel equivalence across engines.

Hosted workflows await maintainer approval for this fork (action_required): API 3, ci. No hosted pass is claimed.