fix(scripts): handle optional leading slash in mintignore directory patterns

[dumanoglu1]

What changed

Updated loadMintIgnore() so directory patterns ending in /* work both with and without a leading slash, and added a focused node:test regression test.

Why

The parser previously used trimmed.slice(1, -2) for every directory pattern, assuming entries were written like /foo/*. A slashless pattern like foo/* was stored as oo, so the intended directory was never ignored.

Fixes #1819

Validation

• node --test scripts/lib/docs-utils.test.js
• node --check scripts/llms.js
• node --check scripts/agents.js
• node --check scripts/lib/docs-utils.js
• node --check scripts/lib/docs-utils.test.js
• git diff --check -- scripts/lib/docs-utils.js scripts/lib/docs-utils.test.js

[cb-heimdall]

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