fix: add bounds checking for CLI array index accesses

[himerus]

Summary

src/cli/index.ts has 12+ locations that access args[0], args[1] without bounds checking before access. Example at lines 375-376:

const cemA = args[0];
const cemB = args[1];
if (!cemA || !cemB) {  // Only checked AFTER access

While TypeScript's noUncheckedIndexedAccess flag makes these return T | undefined, the pattern is inconsistent — some locations check before access, others after. Standardize to check array length first, then access.

Acceptance criteria:

1. All args[] ...

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📥 Commits

Reviewing files that changed from the base of the PR and between 8208b22 and 201ebaa.

📒 Files selected for processing (1)

• src/cli/index.ts

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🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/fix-add-bounds-checking-for-cli-array

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