build: pin packageManager to yarn 1.22.22

[STRML]

Corepack defaults to yarn 4 because nothing pins the version, but the repo ships a yarn 1 lockfile. Consequence: yarn install fails with YN0028 (lockfile would be modified), and every make target that calls export BIN := $(shell yarn bin) dies before make can do anything, which surfaces as a misleading Makefile:32: multiple target patterns error under GNU Make 3.81 after the failed $(shell) leaves BIN empty.

Fix: one line, "packageManager": "yarn@1.22.22" in package.json. corepack now resolves to yarn 1 and both yarn install and make build/make test run as-is.

No other changes. Verified locally: yarn --version → 1.22.22, make build passes the build-contract check, 204/204 tests.

Summary by CodeRabbit

• Chores
  • Specified Yarn version 1.22.22 for project tooling consistency.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: 20f90ee7-34f4-4e27-bda0-9e8d28f65675

📥 Commits

Reviewing files that changed from the base of the PR and between 01989d2 and 2970b72.

📒 Files selected for processing (1)

• package.json

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📝 Walkthrough

Walkthrough

The package manifest now declares Yarn version 1.22.22 through the packageManager field.

Changes

Package manager metadata

Layer / File(s)	Summary
Yarn declaration package.json	Adds the packageManager field with Yarn version 1.22.22.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~3 minutes

Change: Bug fix

Suggested reviewers: binhpv

Merge Risk: ⚪ Minimal · up to 2970b

This change pins the compatible Yarn version and introduces no concrete merge-blocking risk.

🚥 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 clearly and concisely identifies the main change: pinning the package manager to Yarn 1.22.22.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/build-tooling

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package.json

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