refactor(go-oidc): flatten nested if in maskToken

[appleboy]

Summary

Flattens the nested if in maskToken (go-oidc example) into a top-to-bottom guard chain. Pure readability refactor — no behavior change: empty string → "", 1–8 chars → ****, longer → prefix....

AI Authorship

• AI was used. Details:
  • Tool / model: Claude Opus 4.7 via Claude Code (code-simplifier agent)
  • AI-authored files: go-oidc/main.go
  • Human line-by-line reviewed: ⚠️ Not yet reviewed line-by-line by the author — reviewer should read the maskToken change closely.

Change classification

• Leaf node (local impact) — maskToken is a small log-masking helper in a standalone example program; failure is local to that example.

Plan reference

No plan — this came out of a codebase-wide simplification pass. Goal: improve clarity without altering behavior.

Verification

• Unit tests — none in this example module (no test files exist).
• Build: go build ./... and go vet ./... pass in the go-oidc module.
• Manual verification: confirm masking output for the three input classes — "", a short token (≤8 chars), and a long token (>8 chars).

Verifiability check

• Inputs and outputs are documented (three input classes above)
• Reviewer can judge correctness from the 6-line diff alone

Risk & rollback

• Risk: Minimal — single helper, no signature or output change. Worst case is a masking edge case, contained to log output of one example.
• Rollback: Revert the single commit 0a6f85d.

Reviewer guide

• Read carefully: maskToken in go-oidc/main.go — verify the three branches still cover empty / short / long identically to before.
• Spot-check OK: nothing else changed.

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR refactors the maskToken helper in the go-oidc example by flattening a nested if into an early-return guard, keeping the masking behavior the same while improving readability.

Changes:

• Refactored maskToken to return early for the empty-string case instead of checking it inside the len(s) <= 8 branch.

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