docs(board-status): collapse CI badge matrix behind <details>

[zackees]

Summary

• Wrap the per-platform CI badge matrix in docs/BOARD_STATUS.md inside a <details><summary>Expand CI badge matrix</summary> block so it is hidden by default.
• Keeps the page short when readers are scrolling to the supported-platforms reference further down.

Closes #93.

Test plan

• Render docs/BOARD_STATUS.md on github.com and confirm the badge matrix is collapsed by default and expands/collapses correctly.
• Confirm inner ### family headings still render inside the <details> group (blank line after <summary> preserved).

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation
  • CI badge matrix is now collapsible, hidden by default behind an expandable control for improved readability of the board status documentation.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 13c1585f-8d35-404b-bbdd-818a57369fb2

📥 Commits

Reviewing files that changed from the base of the PR and between f86d17a and b9bef59.

📒 Files selected for processing (1)

• docs/BOARD_STATUS.md

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📝 Walkthrough

Walkthrough

The CI badge matrix in the board status documentation has been wrapped in a collapsible HTML <details> element, allowing readers to expand the platform build matrix on demand rather than displaying it prominently by default.

Changes

Cohort / File(s)	Summary
Documentation - Collapsible CI Badges docs/BOARD_STATUS.md	Wrapped the "Per-platform CI badges" section with <details> and <summary> tags to collapse the badge matrix, reducing initial page length and improving navigation.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 Hop, hop, hooray! The badges now hide,
Behind clickety-details with expandable pride,
No more endless scrolling through our CI array,
Just click to reveal—much neater today! ✨

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/collapse-board-status-matrix

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