fix: allow percent-encoded sourceBase path segments

[Aryan Singh K. (aryansk)]

Summary

Allow valid percent-encoded bytes in marketplace sourceBase path segments so Azure DevOps project names such as My%20Projects work.

Changes

• permit %HH sequences in the sourceBase-specific path grammar without loosening package source validation
• decode path segments for a second traversal-safety pass
• reject encoded path separators and invalid UTF-8
• add regression coverage for an ADO %20 project name and encoded traversal/separator cases

Validation

Adds focused schema tests for the reported Azure DevOps URL and for encoded traversal safety.

Fixes #2554

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[Aryan Singh K. (aryansk)]

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[jonny-keen]

any chance you could also add support for these URL encoded paths in a remote repo source as well?

name: my-name
version: 0.1.0
description: description
author: author
dependencies:
  apm: []
  mcp: []
includes: auto
scripts: {}
marketplace:
  owner:
    name: name
    url: url

  outputs:
    claude: {}

  packages:
    - name: my-skill
      source: https://dev.azure.com/myorg/My%20Projects/_git/reponame
      ref: main