fix(slack): accept workspace OAuth responses

[jusso-dev]

Summary by CodeRabbit

• Bug Fixes
  • Improved Slack OAuth response handling when enterprise information is explicitly returned as null.
  • OAuth validation now accepts both absent and null enterprise details, preventing valid responses from being rejected.

[coderabbitai]

Caution

Review failed

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: dcb87455-4564-42a6-a033-67a57eb6e229

📥 Commits

Reviewing files that changed from the base of the PR and between ff45dfd and 90ce6a8.

📒 Files selected for processing (2)

• packages/agent-harness/src/index.ts
• packages/agent-harness/src/testing/fake-slack-server.ts

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📝 Walkthrough

Walkthrough

The Slack OAuth response schema now accepts a null enterprise value, and the fake Slack server includes enterprise: null in successful OAuth responses.

Changes

Slack OAuth contract

Layer / File(s)	Summary
Align OAuth schema and fixture packages/agent-harness/src/index.ts, packages/agent-harness/src/testing/fake-slack-server.ts	The OAuth schema accepts a missing or null enterprise object, while successful fake OAuth responses explicitly return enterprise: null.

Estimated code review effort: 1 (Trivial) | ~5 minutes

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/slack-oauth-null-enterprise

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