docs: Update README for merged 05-First Draft with YAML frontmatter

- Update all references from 06-First Draft to 05-First Draft
- Remove outdated reference to 05-Plot
- Add new section explaining YAML frontmatter support for planning metadata

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

README.md

@@ -182,6 +182,47 @@ A single number (`## Word Count Target: 1800`) sets a point goal; ranges accept
 `-`, `–`, `to`, and grouped digits (`1,500`). Like the other header lines, the
 target is stripped from the exported document.
 
+### YAML frontmatter for planning metadata
+
+For projects using the **snowflake template** or similar structured workflows, files
+can store planning metadata in **YAML frontmatter** at the top of the file. This keeps
+all planning information (target word count, POV, characters, setting, etc.) together with
+the draft content in a single file, while allowing the metadata to be collapsed in the
+editor.
+
+```markdown
+---
+title: "Chapter One: The Beginning"
+slug: chapter-one-the-beginning
+act: 1
+chapter: 1
+scene: 1
+type: chapter
+status: draft
+word_count_target: 2000
+word_count_min: 1800
+word_count_max: 2200
+pov: "Bixby"
+characters:
+  - Bixby
+  - Mom
+setting: "The Old Reynold's House"
+---
+
+# Chapter One: The Beginning
+
+The prose begins here...
+
+### Rough Draft:
+
+Actual draft content...
+```
+
+The YAML frontmatter (delimited by `---` lines) is automatically detected and can be
+collapsed in the editor using the **Collapse header** toggle in the top bar. The
+draft marker (`### Rough Draft:`) is still supported for backward compatibility with
+legacy files.
+
 ## Project mode
 
 Open a **project root** — a folder holding the manuscript alongside the
@@ -189,7 +230,7 @@ characters, outline, premise and the rest — and the app recognises the layout
 instead of treating every file in it as a chapter.
 
 The trigger is simple: if the folder you open contains a subfolder named like
-the **manuscript folder** (`06-First Draft` by default), it is a project. A
+the **manuscript folder** (`05-First Draft` by default), it is a project. A
 plain folder of chapters has no such subfolder, so it behaves exactly as before
 — everything in it is the manuscript.
 
@@ -212,9 +253,8 @@ In a project:
 * **File ▸ New project…** opens the project root, not the drafting folder.
 
 Set which folder is the manuscript under **Settings ▸ New project… ▸ Manuscript
-folder**. The number is optional — `First Draft` matches `06-First Draft` — and
+folder**. The number is optional — `First Draft` matches `05-First Draft` — and
 the setting is global, so every project on this machine uses the same layout.
-If your writing actually lives in `05-Plot`, point it there.
 
 ### Hidden folders
 
@@ -531,7 +571,7 @@ Nothing is written until you press **Create**; generation runs in the background
 so a template whose hooks talk to the network doesn't freeze the editor.
 
 When it finishes, the app opens the project root as the workspace,
-with the **`06-First Draft`** folder (where the snowflake template keeps the
+with the **`05-First Draft`** folder (where the snowflake template keeps the
 chapter files in `Act 1/`, `Act 2/` and `Act 3/` subfolders) automatically
 expanded in the file list. If the template didn't produce that folder, the
 status bar notes that nothing is marked as the manuscript.
@@ -551,7 +591,7 @@ rendering.
 | Setting | Meaning |
 |---|---|
 | **Template** | the folder holding the template's `cookiecutter.json`. Defaults to the bundled `templates/snowflake`; falls back to `~/Documents/Cookiecutters/snowflake` |
-| **Open subfolder** | which folder of the generated project becomes the workspace (default `06-First Draft`; blank opens the project root) |
+| **Open subfolder** | which folder of the generated project becomes the workspace (default `05-First Draft`; blank opens the project root) |
 | **Publish to Gitea after creation** | when enabled and Gitea credentials are configured below, a new repository will be created and the project pushed to it |
 | **Gitea** | server URL, user and token, used to create repositories when publishing is enabled |
 
@@ -667,7 +707,7 @@ Word list…** is that place.
   every name in them at once. It looks for a `Characters` folder (a numeric
   prefix like `03-Characters` is fine) beside the workspace and up to three
   levels above it, so it still finds them while you are editing in
-  `06-First Draft`. Both `# Bixby Reynolds` and `# Name: Jonathan Bronski`
+  `05-First Draft`. Both `# Bixby Reynolds` and `# Name: Jonathan Bronski`
   headings are understood, and an unfilled template sheet (`# Name`,
   `# Protagonist`) contributes nothing. Each part of a name is listed
   separately, since prose says *Bixby* far more often than *Bixby Reynolds*.