asset-validation-debuglisted

# Asset validation + repair Triggered when `asset_validate()`, `asset_generate_*`, or `asset_save_inline_svg` returns warnings or errors. Do NOT loop on the same failure; follow the tree and respect the retry budget. ## Failure code → repair table | Code | Origin | Repair primitive | Retry budget | |---|---|---|---| | `T0_CHECKERBOARD` | Imagen/Gemini rendering fake transparency | **Route change** → `gpt-image-1` (`background:"transparent"`), Ideogram v3 (`style:"transparent"`), Recraft V3 | 2 | | `T0_ALPHA_MISSING` | RGB-only output on transparency-required asset | **Matte** via `asset_remove_background` (BiRefNet preferred, RMBG fallback) | 1 | | `T0_DIMENSIONS` | wrong `width`/`height` API params | Fix params, regenerate | 1 | | `T0_SAFE_ZONE` | subject bleeds outside platform center | Regenerate with explicit `"centered with 20% padding on all sides"` | 1 | | `T0_FILE_SIZE` (SVG) | path count blows budget | `asset_save_inline_svg` → SVGO → K-means color reduction → vtracer | 1 | | `T0_DCT_ENTROPY` | solid-color / NSFW-filter hit | Regenerate same params once; if repeats, change prompt | 1 | | `T1_PALETTE_DRIFT` | model ignored hex constraint | Recraft with `controls.colors` **or** recolor post-process (K-means remap in LAB) | 1 | | `T1_TEXT_MISSPELL` | diffusion garbled wordmark | **Drop text, composite SVG type** (retry Ideogram 3 if text-only asset) | 0 in-diffusion / 1 on Ideogram | | `T1_LOW_CONTRAST` | pale palette at 16×16 or over background | Regenerate with exp