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/CALLOUTS.md

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+# Callouts Reference
+
+## Basic Callout
+
+```markdown
+> [!note]
+> This is a note callout.
+
+> [!info] Custom Title
+> This callout has a custom title.
+
+> [!tip] Title Only
+```
+
+## Foldable Callouts
+
+```markdown
+> [!faq]- Collapsed by default
+> This content is hidden until expanded.
+
+> [!faq]+ Expanded by default
+> This content is visible but can be collapsed.
+```
+
+## Nested Callouts
+
+```markdown
+> [!question] Outer callout
+> > [!note] Inner callout
+> > Nested content
+```
+
+## Supported Callout Types
+
+| Type | Aliases | Color / Icon |
+|------|---------|-------------|
+| `note` | - | Blue, pencil |
+| `abstract` | `summary`, `tldr` | Teal, clipboard |
+| `info` | - | Blue, info |
+| `todo` | - | Blue, checkbox |
+| `tip` | `hint`, `important` | Cyan, flame |
+| `success` | `check`, `done` | Green, checkmark |
+| `question` | `help`, `faq` | Yellow, question mark |
+| `warning` | `caution`, `attention` | Orange, warning |
+| `failure` | `fail`, `missing` | Red, X |
+| `danger` | `error` | Red, zap |
+| `bug` | - | Red, bug |
+| `example` | - | Purple, list |
+| `quote` | `cite` | Gray, quote |
+
+## Custom Callouts (CSS)
+
+```css
+.callout[data-callout="custom-type"] {
+  --callout-color: 255, 0, 0;
+  --callout-icon: lucide-alert-circle;
+}
+```

skills/obsidian-markdown/references/EMBEDS.md

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+# 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
+```
+````

skills/obsidian-markdown/references/PROPERTIES.md

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+# Properties (Frontmatter) Reference
+
+Properties use YAML frontmatter at the start of a note:
+
+```yaml
+---
+title: My Note Title
+date: 2024-01-15
+tags:
+  - project
+  - important
+aliases:
+  - My Note
+  - Alternative Name
+cssclasses:
+  - custom-class
+status: in-progress
+rating: 4.5
+completed: false
+due: 2024-02-01T14:30:00
+---
+```
+
+## Property Types
+
+| Type | Example |
+|------|---------|
+| Text | `title: My Title` |
+| Number | `rating: 4.5` |
+| Checkbox | `completed: true` |
+| Date | `date: 2024-01-15` |
+| Date & Time | `due: 2024-01-15T14:30:00` |
+| List | `tags: [one, two]` or YAML list |
+| Links | `related: "[[Other Note]]"` |
+
+## Default Properties
+
+- `tags` - Note tags (searchable, shown in graph view)
+- `aliases` - Alternative names for the note (used in link suggestions)
+- `cssclasses` - CSS classes applied to the note in reading/editing view
+
+## Tags
+
+```markdown
+#tag
+#nested/tag
+#tag-with-dashes
+#tag_with_underscores
+```
+
+Tags can contain: letters (any language), numbers (not first character), underscores `_`, hyphens `-`, forward slashes `/` (for nesting).
+
+In frontmatter:
+
+```yaml
+---
+tags:
+  - tag1
+  - nested/tag2
+---
+```