Review code for issues and improvements

[BruinGrowly]

Unifies configuration loading, enables async function analysis, and optimizes vocabulary initialization to improve Harmonizer's reliability, coverage, and performance.

This PR resolves several key issues:

1. Configuration: Ensures the CLI correctly loads and applies settings (excludes, thresholds, custom vocabulary) from .harmonizer.yml, harmonizer.yaml, or pyproject.toml by using a unified ConfigLoader. It also correctly roots exclude patterns.
2. Async Function Analysis: Extends the AST walk to include ast.AsyncFunctionDef, ensuring coroutines are analyzed for ICE metrics and disharmony.
3. Performance: Caches the large keyword vocabulary, reducing startup time and silencing verbose initialization messages by default.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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