docs: fix broken CI badge in README

[jamesarich]

Summary

Fixes the root README's CI badge, which pointed at a nonexistent ci.yml workflow (so it rendered as an error). Points it at pull_request.yml, the repo's actual PR workflow.

Type of change

• Documentation only

Context

This PR originally also fixed the KMP release-publish trigger, but that root cause — tags created by GITHUB_TOKEN don't fire push: tags — is already handled, more comprehensively, by #1014 (which fixes all publishers: JSR/npm + KMP, via workflow_call). Re-scoped to just the README badge fix to avoid duplicating #1014.

Verification

Badge target pull_request.yml confirmed present in .github/workflows/.

🤖 Generated with Claude Code

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Review details

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📥 Commits

Reviewing files that changed from the base of the PR and between b73e5ad and 2e977cf.

📒 Files selected for processing (1)

• README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ci/fix-kmp-release-trigger-and-badge

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[github-actions]

The latest Buf updates on your PR. Results from workflow pull-request / build (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Jul 21, 2026, 5:55 PM