chore(platform): improve local Convex dev setup

[Israeltheminer]

Summary

• Improves dev.mjs script to reuse anonymous Convex deployments for local development

Test plan

• npm run dev --workspace=@tale/platform starts correctly with Convex local backend

Summary by CodeRabbit

• Bug Fixes

  • Fixed unnecessary recreation of local deployments on every development run.

• Refactor

  • Improved local deployment environment handling to preserve state across development restarts.
  • Enhanced deployment state management for faster backend reconnection.

[coderabbitai]

Caution

Review failed

The pull request is closed.

📝 Walkthrough

Walkthrough

The changes refine how CONVEX_DEPLOYMENT is handled during local development in the Convex dev script. The implementation now detects whether the current deployment is a local anonymous deployment (identified by "anonymous:" prefix) and preserves it across restarts instead of clearing it. Additionally, the environment setup is modified to only set CONVEX_AGENT_MODE = 'anonymous' when no local deployment exists, and the constructed environment is passed directly to the Convex dev process rather than naively overriding spawn environment variables.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~22 minutes

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch chore/dev-setup-improvements

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