docs: embed rendered flow-diagram preview in the README

[phj6688]

The README's "Flow diagram" section only had a text link to docs/linear-issue-craft-flow.drawio, which GitHub does not render inline, so the diagram was invisible to anyone browsing the repo.

This adds a rendered PNG export (docs/linear-issue-craft-flow.png, from the pinned headless drawio image) and embeds it in the README. The .drawio stays the editable source; the PNG is the viewable preview. SVG was intentionally not used (drawio SVG text lives in foreignObject, which GitHub can render blank).

Docs-only; CI unaffected.

Summary by CodeRabbit

• Documentation
  • Updated the README to display a rendered flow diagram preview.
  • Expanded the flow diagram section to explain its coverage and identify the editable source file.
  • Updated the changelog to reflect the embedded image presentation.

[coderabbitai]

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 7d4e140c-676a-4bc3-91d2-afee065ed8d6

📥 Commits

Reviewing files that changed from the base of the PR and between e77dcc3 and 4a9bbb8.

⛔ Files ignored due to path filters (1)

• docs/linear-issue-craft-flow.png is excluded by !**/*.png

📒 Files selected for processing (2)

• CHANGELOG.md
• README.md

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📝 Walkthrough

Walkthrough

The README now embeds a rendered PNG flow diagram and explains its covered stages and editable draw.io source. The changelog entry reflects this presentation.

Changes

Flow Diagram Documentation

Layer / File(s)	Summary
Embed and document flow diagram README.md, CHANGELOG.md	The README embeds the rendered flow image, describes the classification, drafting, gates, and file path, and identifies the draw.io source for edits; the changelog records the change.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Poem

I’m a bunny with a diagram bright,
PNG petals blooming in README light.
The draw.io source stays close at hand,
Mapping each gate across the land.
Hop, hop—clear paths now stand!

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/readme-embed-diagram

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