fix: incorrect sweettest URL in readme

[pdaoust]

Summary

The URL to sweettest didn't point to anything; just fixing it.

TODO:

• CHANGELOG mentions all code changes.
• docs have been updated (npm run build && git add docs)

Summary by CodeRabbit

• Documentation
  • Updated reference link in README maintenance and testing guidance to correct resource location.

[cocogitto-bot]

✔️ 91f9ba2 - Conventional commits check succeeded.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 01b59d55-c9c9-49f0-95e2-b911a4aa0068

📥 Commits

Reviewing files that changed from the base of the PR and between dd07b2c and 91f9ba2.

📒 Files selected for processing (1)

• README.md

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Walkthrough

Updated a documentation link in README.md from hdk/src/sweetest to holochain/src/sweettest in the maintenance and testing guidance section. Single-line change to reference path without altering surrounding text or functionality.

Changes

Cohort / File(s)	Summary
Documentation README.md	Updated sweettest reference link path from hdk/src/sweetest to holochain/src/sweettest in maintenance/testing guidance.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'fix: incorrect sweettest URL in readme' is clear and specific, accurately describing the main change of correcting a broken URL documentation reference.
Description check	✅ Passed	The pull request description includes both required template sections: a Summary explaining the fix, and a TODO checklist with all items from the template.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/incorrect-sweettest-url

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