Add glob helper for path expansion

[leynos]

Summary

• implement glob() Jinja helper using the glob crate
• test globbing for sorted results and invalid patterns
• document glob design and mark roadmap item complete

Testing

• make check-fmt
• make lint
• make test
• make markdownlint
• make nixie

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https://chatgpt.com/codex/tasks/task_e_68a98de1c57c83229e6b49e3c904a9fd

Summary by Sourcery

Implement a new glob(pattern) Jinja helper for expanding file system paths with sorted results and proper error handling, along with supporting tests and documentation updates.

New Features:

• Add glob(pattern) helper to Jinja environment for file path expansion in manifests

Build:

• Add the glob crate dependency to Cargo.toml

Documentation:

• Document the glob helper design in netsuke-design.md and mark the roadmap item as complete

Tests:

• Add feature tests for glob expansion and invalid pattern errors in manifest.feature
• Add Rust unit tests for sorted glob matches and invalid pattern error handling