refactor: extract fs and path helpers into runtime-utils

[JkrishnaD]

Summary

This PR extracts the filesystem and path helpers previously located in @codama/renderers-core
into a new shared package: @codama/runtime-utils.

The goal is to centralize runtime-specific interactions (e.g. node:fs, node:path) in a
dedicated package so that Codama packages — including renderers — can be imported safely in
non-Node environments.

What changed

• Introduced a new @codama/runtime-utils package
• Moved fs and path helpers into this package without changing behavior
• Updated renderers-core to consume the new shared helpers
• Documented explicit failure behavior in non-Node environments

Notes

• Behavior remains unchanged: filesystem helpers throw in non-Node environments.
• This PR is intentionally scoped to extraction only.

Closes #67

[changeset-bot]

🦋 Changeset detected

Latest commit: 05b2684

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@codama/runtime-utils	Major
@codama/renderers-core	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[JkrishnaD]

@lorisleiva have a look into this and let me know if there is any requirement for the changes

[lorisleiva]

Hi there, thanks for this.

However, I can see a few issues by just running the code with my eyes though:

• @codama/fs-path residues.
• Not re-exporting @codama/runtime-utils inside @codama/renderers-core introduces a breaking change.
• No changesets.
• You're not actually making use of the new @codama/runtime-utils in the anchor adapter.

This is giving me AI slop vibes. Please review your own code thoroughly before publishing and ensure all tests are passing locally.

[JkrishnaD]

hey @lorisleiva

• I’ve pushed follow-up commits addressing the issues you pointed out and which i should have done in the first place.
• Regarding the anchor adapter, I went through nodes-from-anchor and didn’t find any current usage of filesystem or path helpers that would benefit from runtime-utils