⚡ Bolt: Optimize listUseCases file reading concurrency

[seonghobae]

💡 What: Refactored listUseCases to read Markdown files concurrently using fs.promises.readFile and Promise.all instead of a sequential readFileSync loop, and updated the CLI handler to inherently support async executions.
🎯 Why: Iterating over hundreds of Markdown specs synchronously becomes a measurable performance bottleneck for vspec usecase list commands.
📊 Impact: Expected to reduce execution time for listing specifications significantly as the repository size scales.
🔬 Measurement: Verified using ad-hoc Date.now tracking and verified by test suite stability.

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PR created automatically by Jules for task 5108692450158003787 started by @seonghobae

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 69a0950c-deb8-4865-a985-b285c4a2596e

📥 Commits

Reviewing files that changed from the base of the PR and between f4223cb and 8344d90.

📒 Files selected for processing (4)

• .jules/bolt.md
• src/cli.ts
• src/usecase-commands.ts
• tests/authoring.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch bolt-optimize-list-usecases-5108692450158003787

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch bolt-optimize-list-usecases-5108692450158003787

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