chore: migrate development workflow to Bun

[danjdewhurst]

Summary

• switch development and CI commands from npm to Bun
• add bun.lock and remove package-lock.json
• document Bun workflow while keeping pi extension runtime code Node-compatible

Tests

• bun install --frozen-lockfile
• bun run typecheck
• bun pm pack --dry-run

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: b84e1266-5b42-4b82-9630-135443ca91f3

📥 Commits

Reviewing files that changed from the base of the PR and between 35210e5 and 8ba4be8.

⛔ Files ignored due to path filters (2)

• bun.lock is excluded by !**/*.lock
• package-lock.json is excluded by !**/package-lock.json

📒 Files selected for processing (5)

• .github/workflows/ci.yml
• AGENTS.md
• CONTRIBUTING.md
• README.md
• package.json

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