feat(skills): add cross-platform PowerShell support for EXTEND.md checks

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

CLAUDE.md

@@ -399,16 +399,20 @@ For skills with workflows, add as Step 1.1. For utility skills, add as "Preferen
 ```markdown
 **1.1 Load Preferences (EXTEND.md)**
 
-Use Bash to check EXTEND.md existence (priority order):
+Check EXTEND.md existence (priority order):
 
 \`\`\`bash
-# Check project-level first
+# macOS, Linux, WSL, Git Bash
 test -f .baoyu-skills/<skill-name>/EXTEND.md && echo "project"
-
-# Then user-level (cross-platform: $HOME works on macOS/Linux/WSL)
 test -f "$HOME/.baoyu-skills/<skill-name>/EXTEND.md" && echo "user"
 \`\`\`
 
+\`\`\`powershell
+# PowerShell (Windows)
+if (Test-Path .baoyu-skills/<skill-name>/EXTEND.md) { "project" }
+if (Test-Path "$HOME/.baoyu-skills/<skill-name>/EXTEND.md") { "user" }
+\`\`\`
+
 ┌────────────────────────────────────────────┬───────────────────┐
 │                    Path                    │     Location      │
 ├────────────────────────────────────────────┼───────────────────┤
@@ -450,6 +454,6 @@ Custom configurations via EXTEND.md. See **Preferences** section for paths and s
 
 **Notes**:
 - Replace `<skill-name>` with actual skill name (e.g., `baoyu-cover-image`)
-- Use `$HOME` instead of `~` for cross-platform compatibility (macOS/Linux/WSL)
+- Use `$HOME` instead of `~` for cross-platform compatibility (macOS/Linux/WSL/PowerShell)
-- Use `test -f` Bash command for explicit file existence check
+- Use `test -f` (Bash) or `Test-Path` (PowerShell) for explicit file existence check
 - ASCII tables for clear visual formatting

skills/baoyu-article-illustrator/SKILL.md

@@ -47,10 +47,17 @@ See [references/styles.md](references/styles.md) for Core Styles, full gallery,
 **1.5 Load Preferences (EXTEND.md) ⛔ BLOCKING**
 
 ```bash
+# macOS, Linux, WSL, Git Bash
 test -f .baoyu-skills/baoyu-article-illustrator/EXTEND.md && echo "project"
 test -f "$HOME/.baoyu-skills/baoyu-article-illustrator/EXTEND.md" && echo "user"
 ```
 
+```powershell
+# PowerShell (Windows)
+if (Test-Path .baoyu-skills/baoyu-article-illustrator/EXTEND.md) { "project" }
+if (Test-Path "$HOME/.baoyu-skills/baoyu-article-illustrator/EXTEND.md") { "user" }
+```
+
 | Result | Action |
 |--------|--------|
 | Found | Read, parse, display summary |

skills/baoyu-article-illustrator/references/workflow.md

@@ -86,10 +86,17 @@ Check preferences and existing state, then ask ALL needed questions in ONE AskUs
 **CRITICAL**: If EXTEND.md not found, MUST complete first-time setup before ANY other questions or steps. Do NOT proceed to reference images, do NOT ask about content, do NOT ask about type/style — ONLY complete the preferences setup first.
 
 ```bash
+# macOS, Linux, WSL, Git Bash
 test -f .baoyu-skills/baoyu-article-illustrator/EXTEND.md && echo "project"
 test -f "$HOME/.baoyu-skills/baoyu-article-illustrator/EXTEND.md" && echo "user"
 ```
 
+```powershell
+# PowerShell (Windows)
+if (Test-Path .baoyu-skills/baoyu-article-illustrator/EXTEND.md) { "project" }
+if (Test-Path "$HOME/.baoyu-skills/baoyu-article-illustrator/EXTEND.md") { "user" }
+```
+
 | Result | Action |
 |--------|--------|
 | Found | Read, parse, display summary → Continue |

skills/baoyu-comic/references/workflow.md

@@ -34,16 +34,20 @@ Input → Preferences → Analyze → [Check Existing?] → [Confirm 1: Style +
 
 ### 1.1 Load Preferences (EXTEND.md)
 
-Use Bash to check EXTEND.md existence (priority order):
+Check EXTEND.md existence (priority order):
 
 ```bash
-# Check project-level first
+# macOS, Linux, WSL, Git Bash
 test -f .baoyu-skills/baoyu-comic/EXTEND.md && echo "project"
-
-# Then user-level (cross-platform: $HOME works on macOS/Linux/WSL)
 test -f "$HOME/.baoyu-skills/baoyu-comic/EXTEND.md" && echo "user"
 ```
 
+```powershell
+# PowerShell (Windows)
+if (Test-Path .baoyu-skills/baoyu-comic/EXTEND.md) { "project" }
+if (Test-Path "$HOME/.baoyu-skills/baoyu-comic/EXTEND.md") { "user" }
+```
+
 | Path | Location |
 |------|----------|
 | `.baoyu-skills/baoyu-comic/EXTEND.md` | Project directory |

skills/baoyu-compress-image/SKILL.md

@@ -17,16 +17,20 @@ Scripts in `scripts/` subdirectory. `${SKILL_DIR}` = this SKILL.md's directory p
 
 ## Preferences (EXTEND.md)
 
-Use Bash to check EXTEND.md existence (priority order):
+Check EXTEND.md existence (priority order):
 
 ```bash
-# Check project-level first
+# macOS, Linux, WSL, Git Bash
 test -f .baoyu-skills/baoyu-compress-image/EXTEND.md && echo "project"
-
-# Then user-level (cross-platform: $HOME works on macOS/Linux/WSL)
 test -f "$HOME/.baoyu-skills/baoyu-compress-image/EXTEND.md" && echo "user"
 ```
 
+```powershell
+# PowerShell (Windows)
+if (Test-Path .baoyu-skills/baoyu-compress-image/EXTEND.md) { "project" }
+if (Test-Path "$HOME/.baoyu-skills/baoyu-compress-image/EXTEND.md") { "user" }
+```
+
 ┌────────────────────────────────────────────────────────┬───────────────────┐
 │                          Path                          │     Location      │
 ├────────────────────────────────────────────────────────┼───────────────────┤

skills/baoyu-cover-image/SKILL.md

@@ -128,10 +128,17 @@ Analyze + Save Refs → [Output Dir] → [Confirm: 6 Dimensions] → Prompt →
 
 Check EXTEND.md existence (priority: project → user):
 ```bash
+# macOS, Linux, WSL, Git Bash
 test -f .baoyu-skills/baoyu-cover-image/EXTEND.md && echo "project"
 test -f "$HOME/.baoyu-skills/baoyu-cover-image/EXTEND.md" && echo "user"
 ```
 
+```powershell
+# PowerShell (Windows)
+if (Test-Path .baoyu-skills/baoyu-cover-image/EXTEND.md) { "project" }
+if (Test-Path "$HOME/.baoyu-skills/baoyu-cover-image/EXTEND.md") { "user" }
+```
+
 | Result | Action |
 |--------|--------|
 | Found | Load, display summary → Continue |

skills/baoyu-danger-gemini-web/SKILL.md

@@ -44,16 +44,20 @@ Before first use, verify user consent for reverse-engineered API usage.
 
 ## Preferences (EXTEND.md)
 
-Use Bash to check EXTEND.md existence (priority order):
+Check EXTEND.md existence (priority order):
 
 ```bash
-# Check project-level first
+# macOS, Linux, WSL, Git Bash
 test -f .baoyu-skills/baoyu-danger-gemini-web/EXTEND.md && echo "project"
-
-# Then user-level (cross-platform: $HOME works on macOS/Linux/WSL)
 test -f "$HOME/.baoyu-skills/baoyu-danger-gemini-web/EXTEND.md" && echo "user"
 ```
 
+```powershell
+# PowerShell (Windows)
+if (Test-Path .baoyu-skills/baoyu-danger-gemini-web/EXTEND.md) { "project" }
+if (Test-Path "$HOME/.baoyu-skills/baoyu-danger-gemini-web/EXTEND.md") { "user" }
+```
+
 ┌──────────────────────────────────────────────────────────┬───────────────────┐
 │                           Path                           │     Location      │
 ├──────────────────────────────────────────────────────────┼───────────────────┤

skills/baoyu-danger-x-to-markdown/SKILL.md

@@ -70,16 +70,20 @@ Use `AskUserQuestion` with options: "Yes, I accept" | "No, I decline"
 
 ## Preferences (EXTEND.md)
 
-Use Bash to check EXTEND.md existence (priority order):
+Check EXTEND.md existence (priority order):
 
 ```bash
-# Check project-level first
+# macOS, Linux, WSL, Git Bash
 test -f .baoyu-skills/baoyu-danger-x-to-markdown/EXTEND.md && echo "project"
-
-# Then user-level (cross-platform: $HOME works on macOS/Linux/WSL)
 test -f "$HOME/.baoyu-skills/baoyu-danger-x-to-markdown/EXTEND.md" && echo "user"
 ```
 
+```powershell
+# PowerShell (Windows)
+if (Test-Path .baoyu-skills/baoyu-danger-x-to-markdown/EXTEND.md) { "project" }
+if (Test-Path "$HOME/.baoyu-skills/baoyu-danger-x-to-markdown/EXTEND.md") { "user" }
+```
+
 ┌────────────────────────────────────────────────────────────┬───────────────────┐
 │                            Path                            │     Location      │
 ├────────────────────────────────────────────────────────────┼───────────────────┤

skills/baoyu-format-markdown/SKILL.md

@@ -19,16 +19,20 @@ Scripts in `scripts/` subdirectory. `${SKILL_DIR}` = this SKILL.md's directory p
 
 ## Preferences (EXTEND.md)
 
-Use Bash to check EXTEND.md existence (priority order):
+Check EXTEND.md existence (priority order):
 
 ```bash
-# Check project-level first
+# macOS, Linux, WSL, Git Bash
 test -f .baoyu-skills/baoyu-format-markdown/EXTEND.md && echo "project"
-
-# Then user-level (cross-platform: $HOME works on macOS/Linux/WSL)
 test -f "$HOME/.baoyu-skills/baoyu-format-markdown/EXTEND.md" && echo "user"
 ```
 
+```powershell
+# PowerShell (Windows)
+if (Test-Path .baoyu-skills/baoyu-format-markdown/EXTEND.md) { "project" }
+if (Test-Path "$HOME/.baoyu-skills/baoyu-format-markdown/EXTEND.md") { "user" }
+```
+
 ┌──────────────────────────────────────────────────────────┬───────────────────┐
 │                           Path                           │     Location      │
 ├──────────────────────────────────────────────────────────┼───────────────────┤

skills/baoyu-image-gen/SKILL.md

@@ -21,10 +21,17 @@ Official API-based image generation. Supports OpenAI, Google, DashScope (阿里
 Check EXTEND.md existence (priority: project → user):
 
 ```bash
+# macOS, Linux, WSL, Git Bash
 test -f .baoyu-skills/baoyu-image-gen/EXTEND.md && echo "project"
 test -f "$HOME/.baoyu-skills/baoyu-image-gen/EXTEND.md" && echo "user"
 ```
 
+```powershell
+# PowerShell (Windows)
+if (Test-Path .baoyu-skills/baoyu-image-gen/EXTEND.md) { "project" }
+if (Test-Path "$HOME/.baoyu-skills/baoyu-image-gen/EXTEND.md") { "user" }
+```
+
 | Result | Action |
 |--------|--------|
 | Found | Load, parse, apply settings. If `default_model.[provider]` is null → ask model only (Flow 2) |

skills/baoyu-infographic/SKILL.md

@@ -138,16 +138,20 @@ Slug: 2-4 words kebab-case from topic. Conflict: append `-YYYYMMDD-HHMMSS`.
 
 **1.1 Load Preferences (EXTEND.md)**
 
-Use Bash to check EXTEND.md existence (priority order):
+Check EXTEND.md existence (priority order):
 
 ```bash
-# Check project-level first
+# macOS, Linux, WSL, Git Bash
 test -f .baoyu-skills/baoyu-infographic/EXTEND.md && echo "project"
-
-# Then user-level (cross-platform: $HOME works on macOS/Linux/WSL)
 test -f "$HOME/.baoyu-skills/baoyu-infographic/EXTEND.md" && echo "user"
 ```
 
+```powershell
+# PowerShell (Windows)
+if (Test-Path .baoyu-skills/baoyu-infographic/EXTEND.md) { "project" }
+if (Test-Path "$HOME/.baoyu-skills/baoyu-infographic/EXTEND.md") { "user" }
+```
+
 ┌────────────────────────────────────────────────────┬───────────────────┐
 │                        Path                        │     Location      │
 ├────────────────────────────────────────────────────┼───────────────────┤

skills/baoyu-markdown-to-html/SKILL.md

@@ -17,16 +17,20 @@ Converts Markdown files to beautifully styled HTML with inline CSS, optimized fo
 
 ## Preferences (EXTEND.md)
 
-Use Bash to check EXTEND.md existence (priority order):
+Check EXTEND.md existence (priority order):
 
 ```bash
-# Check project-level first
+# macOS, Linux, WSL, Git Bash
 test -f .baoyu-skills/baoyu-markdown-to-html/EXTEND.md && echo "project"
-
-# Then user-level (cross-platform: $HOME works on macOS/Linux/WSL)
 test -f "$HOME/.baoyu-skills/baoyu-markdown-to-html/EXTEND.md" && echo "user"
 ```
 
+```powershell
+# PowerShell (Windows)
+if (Test-Path .baoyu-skills/baoyu-markdown-to-html/EXTEND.md) { "project" }
+if (Test-Path "$HOME/.baoyu-skills/baoyu-markdown-to-html/EXTEND.md") { "user" }
+```
+
 ┌──────────────────────────────────────────────────────────────┬───────────────────┐
 │                             Path                             │     Location      │
 ├──────────────────────────────────────────────────────────────┼───────────────────┤
@@ -83,6 +87,11 @@ Use `AskUserQuestion` to ask whether to format first. Formatting can fix:
 test -f "$HOME/.baoyu-skills/baoyu-post-to-wechat/EXTEND.md" && grep -o 'default_theme:.*' "$HOME/.baoyu-skills/baoyu-post-to-wechat/EXTEND.md"
 ```
 
+```powershell
+# PowerShell (Windows)
+if (Test-Path "$HOME/.baoyu-skills/baoyu-post-to-wechat/EXTEND.md") { Select-String -Pattern 'default_theme:.*' -Path "$HOME/.baoyu-skills/baoyu-post-to-wechat/EXTEND.md" | ForEach-Object { $_.Matches.Value } }
+```
+
 **If theme is resolved from EXTEND.md**: Use it directly, do NOT ask the user.
 
 **If no default found**: Use AskUserQuestion to confirm:

skills/baoyu-post-to-wechat/SKILL.md

@@ -23,16 +23,20 @@ description: Posts content to WeChat Official Account (微信公众号) via API
 
 ## Preferences (EXTEND.md)
 
-Use Bash to check EXTEND.md existence (priority order):
+Check EXTEND.md existence (priority order):
 
 ```bash
-# Check project-level first
+# macOS, Linux, WSL, Git Bash
 test -f .baoyu-skills/baoyu-post-to-wechat/EXTEND.md && echo "project"
-
-# Then user-level (cross-platform: $HOME works on macOS/Linux/WSL)
 test -f "$HOME/.baoyu-skills/baoyu-post-to-wechat/EXTEND.md" && echo "user"
 ```
 
+```powershell
+# PowerShell (Windows)
+if (Test-Path .baoyu-skills/baoyu-post-to-wechat/EXTEND.md) { "project" }
+if (Test-Path "$HOME/.baoyu-skills/baoyu-post-to-wechat/EXTEND.md") { "user" }
+```
+
 ┌────────────────────────────────────────────────────────┬───────────────────┐
 │                          Path                          │     Location      │
 ├────────────────────────────────────────────────────────┼───────────────────┤
@@ -180,13 +184,17 @@ mkdir -p "$(pwd)/post-to-wechat/$(date +%Y-%m-%d)"
 **If API Selected - Check Credentials**:
 
 ```bash
-# Check project-level
+# macOS, Linux, WSL, Git Bash
 test -f .baoyu-skills/.env && grep -q "WECHAT_APP_ID" .baoyu-skills/.env && echo "project"
-
-# Check user-level
 test -f "$HOME/.baoyu-skills/.env" && grep -q "WECHAT_APP_ID" "$HOME/.baoyu-skills/.env" && echo "user"
 ```
 
+```powershell
+# PowerShell (Windows)
+if ((Test-Path .baoyu-skills/.env) -and (Select-String -Quiet -Pattern "WECHAT_APP_ID" .baoyu-skills/.env)) { "project" }
+if ((Test-Path "$HOME/.baoyu-skills/.env") -and (Select-String -Quiet -Pattern "WECHAT_APP_ID" "$HOME/.baoyu-skills/.env")) { "user" }
+```
+
 **If Credentials Missing - Guide Setup**:
 
 ```

skills/baoyu-post-to-x/SKILL.md

@@ -31,16 +31,20 @@ Posts text, images, videos, and long-form articles to X via real Chrome browser
 
 ## Preferences (EXTEND.md)
 
-Use Bash to check EXTEND.md existence (priority order):
+Check EXTEND.md existence (priority order):
 
 ```bash
-# Check project-level first
+# macOS, Linux, WSL, Git Bash
 test -f .baoyu-skills/baoyu-post-to-x/EXTEND.md && echo "project"
-
-# Then user-level (cross-platform: $HOME works on macOS/Linux/WSL)
 test -f "$HOME/.baoyu-skills/baoyu-post-to-x/EXTEND.md" && echo "user"
 ```
 
+```powershell
+# PowerShell (Windows)
+if (Test-Path .baoyu-skills/baoyu-post-to-x/EXTEND.md) { "project" }
+if (Test-Path "$HOME/.baoyu-skills/baoyu-post-to-x/EXTEND.md") { "user" }
+```
+
 ┌──────────────────────────────────────────────────┬───────────────────┐
 │                       Path                       │     Location      │
 ├──────────────────────────────────────────────────┼───────────────────┤

skills/baoyu-slide-deck/SKILL.md

@@ -190,16 +190,20 @@ Input → Preferences → Analyze → [Check Existing?] → Confirm (1-2 rounds)
 
 **1.1 Load Preferences (EXTEND.md)**
 
-Use Bash to check EXTEND.md existence (priority order):
+Check EXTEND.md existence (priority order):
 
 ```bash
-# Check project-level first
+# macOS, Linux, WSL, Git Bash
 test -f .baoyu-skills/baoyu-slide-deck/EXTEND.md && echo "project"
-
-# Then user-level (cross-platform: $HOME works on macOS/Linux/WSL)
 test -f "$HOME/.baoyu-skills/baoyu-slide-deck/EXTEND.md" && echo "user"
 ```
 
+```powershell
+# PowerShell (Windows)
+if (Test-Path .baoyu-skills/baoyu-slide-deck/EXTEND.md) { "project" }
+if (Test-Path "$HOME/.baoyu-skills/baoyu-slide-deck/EXTEND.md") { "user" }
+```
+
 ┌──────────────────────────────────────────────────┬───────────────────┐
 │                       Path                       │     Location      │
 ├──────────────────────────────────────────────────┼───────────────────┤

skills/baoyu-url-to-markdown/SKILL.md

@@ -24,16 +24,20 @@ Fetches any URL via Chrome CDP and converts HTML to clean markdown.
 
 ## Preferences (EXTEND.md)
 
-Use Bash to check EXTEND.md existence (priority order):
+Check EXTEND.md existence (priority order):
 
 ```bash
-# Check project-level first
+# macOS, Linux, WSL, Git Bash
 test -f .baoyu-skills/baoyu-url-to-markdown/EXTEND.md && echo "project"
-
-# Then user-level (cross-platform: $HOME works on macOS/Linux/WSL)
 test -f "$HOME/.baoyu-skills/baoyu-url-to-markdown/EXTEND.md" && echo "user"
 ```
 
+```powershell
+# PowerShell (Windows)
+if (Test-Path .baoyu-skills/baoyu-url-to-markdown/EXTEND.md) { "project" }
+if (Test-Path "$HOME/.baoyu-skills/baoyu-url-to-markdown/EXTEND.md") { "user" }
+```
+
 ┌────────────────────────────────────────────────────────┬───────────────────┐
 │                          Path                          │     Location      │
 ├────────────────────────────────────────────────────────┼───────────────────┤

skills/baoyu-xhs-images/SKILL.md

@@ -199,16 +199,20 @@ Analyze → [Confirm 1] → 3 Outlines → [Confirm 2: Outline + Style + Element
 
 **CRITICAL**: If EXTEND.md not found, MUST complete first-time setup before ANY other questions or steps. Do NOT proceed to content analysis, do NOT ask about style, do NOT ask about layout — ONLY complete the preferences setup first.
 
-Use Bash to check EXTEND.md existence (priority order):
+Check EXTEND.md existence (priority order):
 
 ```bash
-# Check project-level first
+# macOS, Linux, WSL, Git Bash
 test -f .baoyu-skills/baoyu-xhs-images/EXTEND.md && echo "project"
-
-# Then user-level (cross-platform: $HOME works on macOS/Linux/WSL)
 test -f "$HOME/.baoyu-skills/baoyu-xhs-images/EXTEND.md" && echo "user"
 ```
 
+```powershell
+# PowerShell (Windows)
+if (Test-Path .baoyu-skills/baoyu-xhs-images/EXTEND.md) { "project" }
+if (Test-Path "$HOME/.baoyu-skills/baoyu-xhs-images/EXTEND.md") { "user" }
+```
+
 ┌────────────────────────────────────────────────────┬───────────────────┐
 │                        Path                        │     Location      │
 ├────────────────────────────────────────────────────┼───────────────────┤