Drop executable bit on lib/credentials.sh

[smartwatermelon]

Non-Blocking Review Concern: Drop executable bit on lib/credentials.sh

Source: claude bot review
Location: lib/credentials.sh
PR: #39 — feat: inject CCCLI credentials at wrapper launch only (#39)
Date: 2026-04-12

What was flagged

The file is mode 100755 but is only ever sourced, not executed. Shell libraries are conventionally 644. Cosmetic only — no functional impact.

Context

This issue was automatically created from a non-blocking concern identified
during pre-merge review of PR #39. It was safe to merge but worth tracking.

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Created by lib-review-issues.sh

[smartwatermelon]

Consider whether +x bit can be dropped from all the library scripts.