docs: clarify Yarn setup for contributors

[royalpinto007]

Fixes #1357

Summary

• keep the Corepack install step
• enable Corepack so the repo uses the pinned Yarn version
• remove the separate global Yarn install step

Verification

• yarn install --immutable
• yarn workspace @sourcebot/query-language test --run

Summary by CodeRabbit

• Documentation
  • Updated development setup instructions to use Corepack with the repository's pinned Yarn version
  • Corrected grammar in the "Understanding the Licenses" section

[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: cc71aa15-abfc-45b6-a816-d4e58b28fb66

📥 Commits

Reviewing files that changed from the base of the PR and between 483e495 and 02fb2f1.

📒 Files selected for processing (1)

• CONTRIBUTING.md

✅ Files skipped from review due to trivial changes (1)

• CONTRIBUTING.md

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Walkthrough

CONTRIBUTING.md corrects a grammar error ("builds and maintain" → "builds and maintains") and replaces the npm-based global Corepack/Yarn installation steps with corepack enable and a yarn --version verification step that uses the repo's pinned Yarn version.

Changes

Contributor setup documentation update

Layer / File(s)	Summary
Corepack setup steps and grammar fix CONTRIBUTING.md	Fixes "builds and maintain" → "builds and maintains" in the licensing section; replaces npm-based global Yarn installation with corepack enable and yarn --version verification in the Developing Sourcebot setup steps.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• sourcebot-dev/sourcebot#886: Contains prior documentation-only edits to CONTRIBUTING.md, directly overlapping with the file modified in this PR.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'docs: clarify Yarn setup for contributors' clearly and concisely summarizes the main change: updating documentation to clarify the Yarn setup process.
Linked Issues check	✅ Passed	The PR successfully addresses issue #1357 by removing global Yarn installation steps and leveraging Corepack with the repository's pinned Yarn version, exactly as required.
Out of Scope Changes check	✅ Passed	All changes are limited to CONTRIBUTING.md with grammar corrections and setup instruction updates directly aligned with issue #1357 objectives.
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

---

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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 `@CHANGELOG.md`:
- Around line 13-15: The CHANGELOG.md file contains an entry for a
documentation-only change under the "Unreleased" section, but repository
guidelines require that documentation-only updates should not have CHANGELOG
entries. Remove the bullet point that references the contributor setup guide and
Corepack change (PR `#1358`) from the "Changed" subsection under "Unreleased" in
the CHANGELOG.md file.

In `@CONTRIBUTING.md`:
- Around line 58-61: Move the `yarn --version` command to execute after the
repository is cloned and the working directory is changed to sourcebot, rather
than before cloning. Remove `yarn --version` from step 3 (the Corepack enable
block), then add both `cd sourcebot` and `yarn --version` to step 4 (after the
git clone command), remove `cd sourcebot` from step 5, and renumber steps 4 and
5 to become steps 5 and 6 respectively to fix the duplicate step numbering.

🪄 Autofix (Beta)

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: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: c652ba24-130b-473e-8ef6-0f9bb1bc8484

📥 Commits

Reviewing files that changed from the base of the PR and between 7c127b9 and 2f6850e.

📒 Files selected for processing (2)

• CHANGELOG.md
• CONTRIBUTING.md

[brendan-kellam]

thanks!