fix(ci): remove custom title pattern, use release-please default

[FSM1]

Summary

• The custom pull-request-title-pattern: "chore: release${component}" still can't match old merged PRs titled "chore: release main" — the root package has an empty component, producing "chore: release" which collides when release-please tries to parse old titles with " main" appended
• Removing the custom pattern lets release-please use its default title format ("chore(main): release <package> <version>"), which won't collide with the old PR history
• Combined with the bootstrap-sha from fix(ci): add bootstrap-sha to skip old unparseable release PRs #311, this should unblock release-please

Test plan

• After merge, release-please creates a release PR

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 337d2f96-c6e0-4ab4-8451-6d8beb20e5b5

📥 Commits

Reviewing files that changed from the base of the PR and between 23fecee and e091398.

📒 Files selected for processing (1)

• release-please-config.json

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/release-please-default-title

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