⚡ Bolt: Replace array method chains with single for loops in coerce.ts

[Howchie]

💡 What: Replaced multiple instances of chained .map().filter() (or .map().filter().map()) array methods with standard for...of loops in packages/core/src/utils/coerce.ts. Appended an entry tracking this optimization strategy to .jules/bolt.md.
🎯 Why: Chained array operations construct and discard intermediate arrays, which results in unnecessary O(N) array allocations and garbage collection thrashing—especially problematic in hot paths like scheduling, sampling, or coercion utility functions.
📊 Impact: Consolidates O(2N) or O(3N) passes over array inputs down to a single O(N) loop execution and reduces memory allocations significantly for frequent parser calls.
🔬 Measurement: Verify changes via automated testing (npm run test -w @experiments/core) and the typechecker across all tasks (npm run typecheck).

---

PR created automatically by Jules for task 16737482243592719798 started by @Howchie

[google-labs-jules]

👋 Jules, reporting for duty! I'm here to lend a hand with this pull request.

When you start a review, I'll add a 👀 emoji to each comment to let you know I've read it. I'll focus on feedback directed at me and will do my best to stay out of conversations between you and other bots or reviewers to keep the noise down.

I'll push a commit with your requested changes shortly after. Please note there might be a delay between these steps, but rest assured I'm on the job!

For more direct control, you can switch me to Reactive Mode. When this mode is on, I will only act on comments where you specifically mention me with @jules. You can find this option in the Pull Request section of your global Jules UI settings. You can always switch back!

New to Jules? Learn more at jules.google/docs.

---

For security, I will only act on instructions from the user who triggered this task.