Add Dot Fountain v0.1.0

[dyiapanis]

Dot Fountain — Fountain screenplay support for MarkEdit

What it does: adds native .fountain screenplay editing to MarkEdit — spec-correct fountain.io syntax support with a live, Slugline-style formatted view (bold scene slugs, indented dialogue, grey scaled structural elements), plus an optional print-accurate preview pane (AWG Suggested Script Layout, Courier 12, title page rendering, scene numbers at both margins, draggable divider).

Registry entry: extensions/markedit-dot-fountain.json

• id: markedit-dot-fountain, version 0.1.0
• URL: release asset (v0.1.0), bytes pinned via sha256: c69dc8be…30f — verified byte-identical to the release download before this PR
• Source: https://github.com/dyiapanis/dot-fountain (MIT)

Features: line classifier per the fountain.io spec; live formatting decorations (CodeMirror 6 ViewPlugin); AWG-geometry preview pane with title page; scene navigation (Alt+↑/↓) and document stats; Live Preview / Source mode toggle; auto-detection so plain markdown files are untouched.

Testing: 40 unit tests (classifier + renderer), plus an automated browser harness (real CodeMirror + mock MarkEdit host) with DOM assertions and screenshot-verified layout — divider drag, pane geometry, page width, and decoration classes all verified end-to-end before release. MIT licensed, no remote code beyond the pinned release asset.

Happy to make changes per the registry's conventions — first registry submission, so corrections welcome.

[cyanzhong]

Thank you for your contribution!

I've removed the addedDate field, it should be added by the CI pipeline. Also simplified the description a little bit.

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