ci: add workflow_dispatch with branch and prerelease inputs

[FBumann]

Summary

• Add workflow_dispatch trigger with branch and prerelease inputs
• Pass target-branch and prerelease to the release-please action
• Push to main uses config default (prerelease: true), dispatch can override

Test plan

• Trigger workflow manually from Actions tab, verify inputs appear
• Push to main, verify release-please still creates alpha pre-release PRs
• Dispatch with prerelease: false for a stable release

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 0ca31005-0434-4b54-8fcf-e7b2121fe1a0

📥 Commits

Reviewing files that changed from the base of the PR and between 935b58d and 3809da5.

📒 Files selected for processing (1)

• .github/workflows/release.yaml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ci/release-dispatch

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