Add baoyu-skills package

baoyu-skills/docs/image-generation.md

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+# Image Generation Guidelines
+
+Skills that require image generation MUST delegate to available image generation tools (runtime-native tools or installed skills).
+
+**Backend selection convention**: see [image-generation-tools.md](image-generation-tools.md) for the runtime-neutral rule. Short version: use whatever backend is available; if multiple, ask the user once; if none, ask how to proceed. This document covers output conventions (naming, paths) that apply regardless of which backend is selected.
+
+## Skill Selection
+
+1. Follow the rule in [image-generation-tools.md](image-generation-tools.md): use whatever backend is available; ask only on ambiguity.
+2. Read the chosen backend's documentation for parameters and capabilities.
+3. If user requests a specific backend, honor it.
+
+## Generation Flow Template
+
+```markdown
+### Step N: Generate Images
+
+**Backend Selection**:
+1. Detect available image-generation tools/skills (runtime-native + installed)
+2. If one available → use it. If multiple → ask user once. If none → ask how to proceed.
+3. Read the chosen backend's docs for parameters
+
+**Generation Flow**:
+1. Write the full prompt to `prompts/NN-{type}-[slug].md` BEFORE invoking the backend
+2. Call backend with the prompt (or prompt file), output path, and parameters
+3. Generate sequentially by default (batch parallel only when backend supports it and user has multiple prompts)
+4. Output progress: "Generated X/N"
+5. On failure, auto-retry once before reporting error
+```
+
+**Batch Parallel** (`baoyu-image-gen` only): concurrent workers with per-provider throttling via `batch.max_workers` in EXTEND.md.
+
+## Output Path Convention
+
+**Output Directory**: `<skill-suffix>/<topic-slug>/`
+- `<skill-suffix>`: e.g., `xhs-images`, `cover-image`, `slide-deck`, `comic`
+- `<topic-slug>`: 2-4 words, kebab-case from content topic
+- Conflict: append timestamp `<topic-slug>-YYYYMMDD-HHMMSS`
+
+**Source Files**: Copy to output dir as `source-{slug}.{ext}`
+
+## Image Naming Convention
+
+**Format**: `NN-{type}-[slug].png`
+- `NN`: Two-digit sequence (01, 02, ...)
+- `{type}`: cover, content, page, slide, illustration, etc.
+- `[slug]`: 2-5 word kebab-case descriptor, unique within directory
+
+Examples:
+```
+01-cover-ai-future.png
+02-content-key-benefits.png
+03-slide-architecture-overview.png
+```