fix(build): look up example skip patterns by directory name

[Ref34t]

Fixes #284.

Problem

Per-example overrides in context/skip-patterns.yaml were looked up by the wrong key for any skill with a single example, so they never applied.

scripts/lib/skill-generator.js:644

skipPatterns.examples[isSingle ? skill.id : dirName]

Keys in the examples: block are example directory names — laravel, android, swift-xcodegen. With one example path the lookup used skill.id (integration-laravel) instead, missed, and returned undefined. mergeSkipPatterns treats that as "no overrides" and the build carried on with no error.

isSingle is the right switch for the other two things it controls — the output filename and the display title, both generated by the build. Config keys are typed by hand, and they are always directory names, so the same branch shouldn't apply here.

Fix

One lookup, always by directory name, extracted so it can be tested:

function skipPatternsForExample(skipPatterns, dirName) {
    return mergeSkipPatterns(skipPatterns.global, skipPatterns.examples?.[dirName]);
}

No key in skip-patterns.yaml is a skill id today, so nothing that currently resolves stops resolving.

Effect on shipped skills

Two skills had overrides that were being dropped. Rebuilt and compared references/EXAMPLE.md:

Skill	Before	After	Removed
integration-laravel	81,558	60,662	20,896 (26%)
integration-android	67,047	50,906	16,141 (24%)

The Laravel case is almost entirely bootstrap/cache/services.php, Laravel's generated package-discovery cache — a machine-written list of class names that Laravel's own .gitignore excludes. It was 17% of that skill. For scale, references/COMMANDMENTS.md in the same bundle is 1,618 bytes.

integration-swift has two example paths, so it was already taking the dirName branch. Its allow rescue for project.yml still works after the change — verified, still 8 occurrences in EXAMPLE-swift-xcodegen.md.

Tests

Five added to scripts/lib/tests/skip-patterns.test.js, including the one that pins the bug:

it('does not look overrides up by skill id', () => {
    const patterns = skipPatternsForExample(config, 'integration-laravel');
    expect(shouldSkip('bootstrap/cache/services.php', patterns)).toBe(false);
});

The existing suite covered mergeSkipPatterns and shouldSkip, which were both correct — the bug was in the key handed to them, which nothing exercised.

npm test       ✅ 142 passing
npm run build  ✅ 118 skills

Worth a follow-up

The lookup failed silently. A key in examples: that matches no example directory produces no warning, so a rule can look right in the file and do nothing. A build-time check that every examples: key resolves would turn this class of bug into an error. Left out here to keep the change to one thing — happy to add it if you want it.

Separately, bootstrap/cache/*.php is generated output committed to example-apps/laravel. This PR stops it reaching the bundle, but removing it from the repo would be worth doing on its own.