List the h3 example in the examples index

[lntutor]

The h3 example was easy to miss because examples/README.md did not list it. This adds the existing example to the index with a short description of the H3 integration it demonstrates.

Closes #884

Verification

• /tmp/hongdown --check examples/README.md
• git diff --check
• Confirmed the link target contains the H3 application and Fedify integration source files

AI assistance

OpenAI Codex (gpt-5.6) assisted with repository policy review, wording, and validation commands. I reviewed the final diff and ran the repository-pinned Hongdown 0.5.3 check locally.

[netlify]

✅ Deploy Preview for fedify-json-schema canceled.

Name	Link
🔨 Latest commit	54cf043
🔍 Latest deploy log	https://app.netlify.com/projects/fedify-json-schema/deploys/6a6ca190e0409b00095c3b71

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: 3357da46-c6d1-4e1d-81a1-4de203da0782

📥 Commits

Reviewing files that changed from the base of the PR and between 32e9952 and 54cf043.

📒 Files selected for processing (1)

• examples/README.md

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📝 Walkthrough

Walkthrough

The examples index now includes an H3 integration example with a link and description.

Changes

H3 example index

Layer / File(s)	Summary
Add H3 example entry examples/README.md	The examples README links to ./h3/ and describes federation served through an H3 application.

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

Suggested reviewers: 2chanhaeng, dahlia

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly states that the H3 example will be added to the examples index.
Description check	✅ Passed	The description directly explains the documentation change, validation steps, and linked issue.
Linked Issues check	✅ Passed	The PR adds examples/h3 to examples/README.md with a relevant description, satisfying issue #884.
Out of Scope Changes check	✅ Passed	The changes are limited to documenting the existing H3 example and validating the documentation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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