fix(meshy): derive download extension from URL pathname

[Fl0p]

Summary

Fix extFromUrl() to parse the URL pathname basename instead of splitting the entire URL string on ., preventing TLD segments (e.g. io/x) from leaking into download filenames when the path has no extension.

Verification

node -e acceptance cases (all ok):

{"url":"https://cdn.meshy.io/x","got":"png","want":"png","ok":true}
{"url":"https://assets.meshy.ai/a/model.glb?X=1","got":"glb","want":"glb","ok":true}
{"url":"https://x.com/a.png#frag","got":"png","want":"png","ok":true}
{"url":"not-a-url","got":"fbx","want":"fbx","ok":true}
{"url":"/relative/path.obj","got":"glb","want":"glb","ok":true}

• npm run docs:build — clean
• node plugins/meshy/skills/meshy/scripts/meshy.mjs version — exactly one JSON object on STDOUT

Test plan

• Acceptance cases above
• docs build
• version command output contract

Made with Cursor

[Fl0p]

self-merged under envelope (low-risk: localized extFromUrl bugfix), CI N/A (claude-review dead); verified locally at 1e63daa

[coderabbitai]

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