docs: document minimum bun version requirement

[r69shabh]

The catalog: protocol used throughout package.json for shared dependencies requires Bun 1.2.0+. On older versions, bun install fails with a confusing error about "git clone" for @types/bun, which looks like a network problem but is actually just an unsupported feature.

Added "bun": ">=1.2.0" to the engines field in package.json and a one-line note to the install step in CONTRIBUTING.md.

Noticed this while setting up locally to work on #638.

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Summary by cubic

Clarifies and enforces a minimum Bun version to support the catalog: protocol and prevent misleading install errors. Previously bun install on Bun <1.2.0 failed with a git clone error for @types/bun; now we require Bun ≥1.2.0 and document the exact Bun version pinned via packageManager to avoid install conflicts.

• Adds "bun": ">=1.2.0" to the engines field in package.json.
• Updates CONTRIBUTING.md to call out the minimum and the pinned Bun version (with Corepack activation guidance).

Developer action

• Upgrade Bun to ≥1.2.0 and verify with bun --version.
• Use the pinned Bun version from packageManager to install and run locally.

^{Written for commit 6fdaca9. Summary will update on new commits.}

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[greptile-apps]

Greptile Summary

Adds Bun 1.2.0 as the documented minimum version needed for the repository’s dependency protocol.

• Declares "bun": ">=1.2.0" in the root package’s engines field.
• Adds the minimum version and a version-check command to the contribution setup instructions.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
CONTRIBUTING.md	Documents Bun 1.2.0 as the minimum version for dependency installation and tells contributors how to check their version.
package.json	Adds the Bun minimum-version declaration to the root package metadata.

_{Reviews (2): Last reviewed commit: "docs: document minimum bun version requi..." | Re-trigger Greptile}