refactor: replace @octokit/rest with octokit

[gr2m]

Summary

@octokit/rest is a legacy module that only covers the REST API client. The octokit package is the recommended all-batteries-included SDK that combines:

• REST API client (octokit.rest.*)
• GraphQL client
• Webhooks handling
• GitHub App authentication

This PR replaces @octokit/rest with octokit across the @github-tools/sdk package. All REST API calls now go through the octokit.rest.* namespace, which is functionally equivalent — no behavior changes.

Changes

• Updated dependency from @octokit/rest to octokit in package.json
• Changed imports in client.ts and type re-exports in types.ts
• Updated all tool files (search.ts, repository.ts, pull-requests.ts, issues.ts, commits.ts) to use octokit.rest.* instead of octokit.*

Test plan

• pnpm install succeeds
• pnpm --filter @github-tools/sdk build succeeds
• pnpm --filter @github-tools/sdk typecheck passes
• Verify tools work end-to-end with a GitHub token

[github-actions]

Thank you for following the naming conventions! 🙏

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	typescript-eslint@​8.56.1
	octokit@​5.0.5
	eslint@​10.0.2 ⏵ 9.39.3

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