fix: polyfill Buffer for AWS request signing in V8

[AdamAmr05]

hello convex friends, this fixes #62.

Some AWS SDK versions allowed by the component’s dependency range require a global Buffer during SigV4 signing. Convex’s default V8 runtime does not provide one, causing R2 operations such as metadata synchronization to fail after an upload reaches the bucket.

This adds the browser-compatible buffer package at the shared R2 client boundary and regression coverage in the repository’s Edge-runtime test environment.

[coderabbitai]

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ℹ️ Recent review info

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Run ID: 01e64138-d825-4b33-9799-088df76919e9

📥 Commits

Reviewing files that changed from the base of the PR and between 52b5cbf and 18f3f86.

⛔ Files ignored due to path filters (1)

• package-lock.json is excluded by !**/package-lock.json

📒 Files selected for processing (3)

• package.json
• src/client/index.test.ts
• src/shared.ts

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📝 Walkthrough

Walkthrough

The package adds buffer as a runtime dependency. Shared initialization imports its Buffer implementation and assigns it to globalThis.Buffer when the global is unavailable. Client tests simulate the edge runtime, reload the shared client factory, verify Buffer initialization, and send a HeadObjectCommand through middleware that rejects with a sentinel error.

Suggested reviewers: ianmacartney

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: adding a Buffer polyfill for AWS request signing in the V8 runtime.
Description check	✅ Passed	The description matches the implemented fix and regression coverage for the V8 Buffer issue.
Linked Issues check	✅ Passed	The changes add a Buffer polyfill at the shared R2 client boundary and test it, which addresses issue #62's signing failure in V8.
Out of Scope Changes check	✅ Passed	The dependency bump, shared polyfill, and test updates all align with the Buffer signing fix and do not appear out of scope.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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