v0.6.3

chore: migrate code from wealthsimple org (#1)

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## Summary

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one. -->
Migrating code from our private org to the open source org
## Changes

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## Test plan

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## Checklist

- [ ] I've read the project's `CONTRIBUTING.md`.
- [ ] Tests cover the change.
- [ ] Documentation updated where relevant.
- [ ] For security-sensitive changes (auth, authz, crypto, dependency
      manifests): flagged in the description for reviewer visibility.