docs: initialize project and codebase maps

- Finalized PROJECT.md incorporating 'Zero-Pollution' constraints
- Enforced native Git portability (git pull sync only)
- Generated ARCHITECTURE.md and STACK.md maps
- Deleted .agent/skills/.gitignore to physically track flattened skills

.agent/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
+```
+````