improve token acquisition for gh events service

[dhth]

Treat the GitHub token as stable client configuration instead of passing
it through every service method and private helper.

GitHubEvents.Default is now parameterized by the token which lets the
service capture it, while HttpClient.mapRequest configures
authentication and GitHub headers once for every request made by the
service.

Since token acquisition is effectful, Layer.unwrapEffect turns it into
layer construction. Error handling now wraps the fully provided program
so token-acquisition and service-construction failures are handled too.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 3615baa8-9da8-498e-9d98-8f47f9cc4849

📥 Commits

Reviewing files that changed from the base of the PR and between fc69d16 and 2701ffc.

📒 Files selected for processing (2)

• src/index.ts
• src/services/github/events.ts

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📝 Walkthrough

Walkthrough

GitHub event retrieval now receives its bearer token through service options and applies authentication and GitHub headers at the HTTP client level. Event collection and fetching no longer pass tokens through their method signatures. The application entry point constructs the CLI and GitHub events layers, provides them with the HTTP client layer, formats retrieved events, and runs the resulting program.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly matches the main change: improving GitHub events token acquisition.
Description check	✅ Passed	The description accurately describes the token-capture and layer-construction changes in the pull request.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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