chore: Add comprehensive Sentry integration with tracing and source maps

[BYK]

Summary

This PR upgrades Craft's Sentry integration with:

• Hardcoded DSN (removes env-variable dependency)
• 100% tracing enabled for all operations
• Comprehensive performance monitoring for key actions
• Automatic source map uploads on master builds

Changes

Sentry SDK Configuration

• Created src/instrument.ts with hardcoded DSN and full tracing
• Removed env-variable based DSN configuration
• Added PII scrubbing (home directory paths, server names)
• Set environment and release tracking

Tracing

• Added tracing utilities (src/utils/tracing.ts)
• Wrapped CLI entry point in craft.cli span
• Added spans for prepare (craft.prepare) and publish (craft.publish) commands
• Added spans for each target publish operation (craft.target.{id})
• Added spans for GitHub API operations (craft.github.*)

Source Maps

• Added @sentry/esbuild-plugin dependency
• Created build.mjs with Sentry plugin configuration
• Source maps upload automatically on master builds when SENTRY_AUTH_TOKEN is available
• Maps are deleted after upload for security

CI Updates

• Updated build workflow to use environment: production on master
• Non-master builds skip source map uploads gracefully

Testing

• No linting errors
• Build script handles missing token gracefully
• All tracing spans properly configured

[github-actions]

Semver Impact of This PR

🟢 Patch (bug fixes)

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Build / dependencies / internal 🔧

• Add comprehensive Sentry integration with tracing and source maps by BYK in #697

• Migrate from Yarn to pnpm 10.27.0 by BYK in #693

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