fix: correct package.json require path in codeMetadata (version always "Unknown")

[Copilot]

; Version: in G-code metadata always emitted Unknown because the require path was resolved relative to the compiled file's location and pointed at a non-existent src/package.json.

Changes

• src/slicer/gcode/coders.coffee — fix off-by-one directory in require path:

  # Before (resolves to src/package.json — does not exist)
  pkg = require('../../package.json')
  
  # After (resolves to root package.json)
  pkg = require('../../../package.json')

• src/slicer/gcode/coders.test.coffee — strengthen metadata test to assert the version equals the actual pkg.version and explicitly rejects "Unknown".

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[Copilot]

Pull request overview

Fixes the require path for package.json in codeMetadata so the version string in G-code metadata resolves correctly instead of always falling back to "Unknown". Strengthens the test to assert the actual version value.

Changes:

• Fixed the relative require path from ../../package.json to ../../../package.json in coders.coffee
• Updated test to verify the version matches pkg.version and rejects "Unknown"
• Minor package-lock.json churn (removed libc fields)

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
src/slicer/gcode/coders.coffee	Fix require path to resolve root package.json
src/slicer/gcode/coders.test.coffee	Assert actual version value in metadata test
package-lock.json	Unrelated lockfile churn

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