Engine: Add parser_options passthrough and engine config support

[marcoroth]

This pull request adds parser_options passthrough support to Herb::Engine and makes engine options configurable via .herb.yml.

Previously, parser options like strict had to be individually wired through the engine as dedicated properties. Now, any parser option can be passed through directly:

Herb::Engine.new(template, parser_options: { strict: false, render_nodes: true })

Engine options can also be configured at the project level in .herb.yml:

  engine:
    debug: true
    optimize: true
    parser_options:
      strict: false

The priority chain is: per-call properties > .herb.yml config > parser defaults.

Additionally, debug now reads from .herb.yml configuration like optimize already does.

Resolves #1102

[pkg-pr-new]

npx https://pkg.pr.new/@herb-tools/formatter@1657

npx https://pkg.pr.new/@herb-tools/language-server@1657

npx https://pkg.pr.new/@herb-tools/linter@1657

commit: 2c1ea66

[github-actions]

🌿 Interactive Playground and Documentation Preview

A preview deployment has been built for this pull request. Try out the changes live in the interactive playground:

• Playground Preview
• Documentation Preview
• Website Preview

---

_{🌱 Grown from commit 2c1ea66}

---

✅ Preview deployment has been cleaned up.