docs: README minor improvements

[master-bob]

• Centers the badges.
• Sets the certificate SHAs into code blocks, allowing one-click copying

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: cb639717-7623-4f10-b67d-4c2ab2ca1b1e

📥 Commits

Reviewing files that changed from the base of the PR and between 69c2cd6 and 5566e15.

📒 Files selected for processing (1)

• README.md

Included review availability: Your plan provides up to 8 included reviews per hour; 7 remain after this review.

📜 Recent review details

🧰 Additional context used

🪛 markdownlint-cli2 (0.23.2)

README.md

[warning] 18-18: Heading levels should only increment by one level at a time
Expected: h3; Actual: h4

(MD001, heading-increment)

🔇 Additional comments (2)

README.md (2)

5-6: LGTM!

Also applies to: 16-16

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20-26: LGTM!

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📝 Walkthrough

Walkthrough

The README now centers the app-store badges and formats the Prod and Alpha release certificate SHA-256 digests in fenced text blocks.

Changes

README presentation updates

Layer / File(s)	Summary
Badge and digest formatting README.md	The badge images are wrapped in a centered <div>. The release certificate digests use a heading and fenced text blocks while keeping the same values.

Priority: ⬇️ Low

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

Change: Other

Suggested reviewers: ignoramous

Merge Risk: ⚪ Minimal · up to 5566e

The README-only presentation changes are safe to merge.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately identifies documentation changes to the README. It is broad but remains relevant to the badge alignment and certificate SHA formatting updates.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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