feat: improve skill quality scores across 4 skills

Ran skills through tessl evaluation tooling and applied targeted
improvements to structure, conciseness, and workflow clarity.

| Skill             | Before | After | Change |
|-------------------|--------|-------|--------|
| defuddle          |  100%  | 100%  |   --   |
| json-canvas       |   83%  | 100%  |  +17%  |
| obsidian-bases    |   83%  | 100%  |  +17%  |
| obsidian-cli      |   94%  | 100%  |   +6%  |
| obsidian-markdown |   71%  |  94%  |  +23%  |

Changes:
- Add structured workflows with validation steps
- Extract verbose reference tables to references/ files (progressive disclosure)
- Remove standard Markdown content Claude already knows (obsidian-markdown)
- Add troubleshooting section for common YAML/formula errors (obsidian-bases)
- Restructure plugin dev section into numbered test cycle (obsidian-cli)
- Condense redundant examples, keep one per pattern

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

skills/obsidian-markdown/references/EMBEDS.md

@@ -0,0 +1,63 @@
+# Embeds Reference
+
+## Embed Notes
+
+```markdown
+![[Note Name]]
+![[Note Name#Heading]]
+![[Note Name#^block-id]]
+```
+
+## Embed Images
+
+```markdown
+![[image.png]]
+![[image.png|640x480]]    Width x Height
+![[image.png|300]]        Width only (maintains aspect ratio)
+```
+
+## External Images
+
+```markdown
+![Alt text](https://example.com/image.png)
+![Alt text|300](https://example.com/image.png)
+```
+
+## Embed Audio
+
+```markdown
+![[audio.mp3]]
+![[audio.ogg]]
+```
+
+## Embed PDF
+
+```markdown
+![[document.pdf]]
+![[document.pdf#page=3]]
+![[document.pdf#height=400]]
+```
+
+## Embed Lists
+
+```markdown
+![[Note#^list-id]]
+```
+
+Where the list has a block ID:
+
+```markdown
+- Item 1
+- Item 2
+- Item 3
+
+^list-id
+```
+
+## Embed Search Results
+
+````markdown
+```query
+tag:#project status:done
+```
+````