Add readme for h3 example

[m2nsp]

Summary

• Add examples/h3/README.md to document the H3 example.

Fixes #882

Test plan

• hongdown --check examples/h3/README.md

AI disclosure

This change was written with assistance from ChatGPT (GPT-5.5-mini), reviewed and verified by me.

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[coderabbitai]

📝 Walkthrough

Walkthrough

Added a README for the Fedify–H3 integration example. The README describes the integration and provides repository setup, server startup, and actor URL lookup instructions.

Changes

H3 example documentation

Layer / File(s)	Summary
Document H3 example setup examples/h3/README.md	Adds the H3 integration description and instructions to clone the repository, configure mise, enter the example directory, start the Deno server, and look up an actor with @fedify/cli.

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

Possibly related issues

• Issue 884 — Documents the same examples/h3 integration in a different README.

Possibly related PRs

• fedify-dev/fedify#975 — Adds the H3 integration example to the examples index.

Suggested reviewers: 2chanhaeng

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the addition of a README for the H3 example.
Description check	✅ Passed	The description accurately states that the H3 example README was added and identifies the validation command.
Linked Issues check	✅ Passed	The README includes a description, setup steps, the run command, and actor lookup guidance required by issue #882.
Out of Scope Changes check	✅ Passed	The changes are limited to the README requested for the H3 example and contain no unrelated code changes.
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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[coderabbitai]

Actionable comments posted: 2

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@examples/h3/README.md`:
- Around line 13-23: Update the setup instructions in the h3 README so the
example-directory command enters the cloned repository first, using cd
fedify/examples/h3 or an equivalent preceding cd fedify step before the existing
examples/h3 path.
- Around line 37-41: Update the actor URL code fence in the README instructions
to include an appropriate language identifier on its opening fence, resolving
the MD040 warning while leaving the URL content unchanged.

🪄 Autofix

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: 966f2b23-94eb-49a3-b3bd-435aee853162

📥 Commits

Reviewing files that changed from the base of the PR and between 15ad151 and 615e11b.

📒 Files selected for processing (1)

• examples/h3/README.md

[2chanhaeng]

I think the example flow should be clearer.

1. Clone the repository
2. Go to the directory of the cloned repository
3. Trust and install dependencies using mise
4. Go to the h3 example directory
5. Open the server using Deno
6. Lookup an actor using @fedify/cli

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.
see 2 files with indirect coverage changes

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[2chanhaeng]

Great work! Please apply this comment then I'll approve this PR.

[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@examples/h3/README.md`:
- Line 44: Update the step text in the README from “Lookup an actor using
`@fedify/cli`” to “Look up an actor using `@fedify/cli`,” using the phrasal verb
form.

🪄 Autofix

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: 3432e5ab-ed94-4544-a3fa-652240ef00a0

📥 Commits

Reviewing files that changed from the base of the PR and between 615e11b and 905a8d5.

📒 Files selected for processing (1)

• examples/h3/README.md

[2chanhaeng]

Great work! Before merging this PR, please rebase from the main branch.

[2chanhaeng]

Great work! Thanks for your contribution!

[2chanhaeng]

Before merging this PR, please rebase from the main branch.