Architect Multi-Provider OAuth Token Exchange for GitHub and Stellar Wallet Integration

[temma02]

Description

Implement a multi-provider OAuth token exchange flow that coordinates authentication across GitHub and Stellar wallet integrations, providing a unified identity layer while keeping provider tokens isolated.

Requirements and Context

• Security: Provider tokens must remain isolated and securely stored
• Testing: Test multi-provider token exchange
• Documentation: Document the token exchange flow

Suggested Execution

Branch: feat/issue-125-multi-provider-oauth-token-exchange

Implement Changes

• Implement a token exchange flow coordinating GitHub and Stellar wallet auth
• Keep provider tokens isolated and securely stored per provider
• Link provider identities to a single platform identity
• Handle the case where one provider is connected but not the other

Test and Commit

• Test token exchange for each provider
• Test identity linking across providers
• Document the token exchange flow

Example Commit Message

feat(auth): architect multi-provider OAuth token exchange for GitHub and Stellar

- Coordinate auth across GitHub and Stellar wallet
- Keep provider tokens isolated and securely stored
- Link provider identities to a single platform identity

Guidelines

• Store provider tokens isolated and encrypted
• Link identities without merging provider tokens
• Handle partial provider connection states