feat\!: rename baoyu-imagine→baoyu-image-gen, baoyu-image-cards→baoyu-xhs-images (v2.0.0)

BREAKING CHANGE: removed `baoyu-imagine` and `baoyu-image-cards`. All
functionality now lives under `baoyu-image-gen` and `baoyu-xhs-images`
respectively. Cross-skill `## Image Generation Tools` examples updated
across baoyu-article-illustrator, baoyu-comic, baoyu-cover-image,
baoyu-infographic, and baoyu-slide-deck.

Migration: existing `~/.baoyu-skills/baoyu-imagine/EXTEND.md` configs are
auto-renamed to `…/baoyu-image-gen/EXTEND.md` on first run via the
legacy-path resolver in `scripts/main.ts`.

skills/baoyu-image-gen/references/providers/zai.md

@@ -6,7 +6,7 @@ Read when the user picks `--provider zai` or sets `default_model.zai`. Default m
 
 **`glm-image`** (recommended default)
 
-- Text-to-image only in baoyu-imagine (no `--ref` support yet)
+- Text-to-image only in baoyu-image-gen (no `--ref` support yet)
 - Native `quality` options are `hd` and `standard`; this skill maps `2k → hd` and `normal → standard`
 - Recommended sizes: `1280x1280`, `1568x1056`, `1056x1568`, `1472x1088`, `1088x1472`, `1728x960`, `960x1728`
 - Custom `--size` requires width/height in `[1024, 2048]`, divisible by `32`, total pixels ≤ `2^22`
@@ -17,7 +17,7 @@ Read when the user picks `--provider zai` or sets `default_model.zai`. Default m
 
 ## Behavior Notes
 
-- The sync API returns a temporary URL; baoyu-imagine downloads it and writes locally
+- The sync API returns a temporary URL; baoyu-image-gen downloads it and writes locally
 - `--ref` is not supported for Z.AI in this skill yet
 - The sync API returns a single image, so `--n > 1` is rejected