Fix invalid JSON manifest schema URL references to the live Plaster schema

[Copilot]

Generated and sample JSON manifests referenced a non-existent schema URL (.../v2/schema/...), causing editor schema loading to fail with 404 and breaking validation/autocomplete. This PR repoints schema references to the current raw schema location in this repository.

• Runtime manifest generation

  • Updated JSON $schema emitted by:
    • New-PlasterManifest
    • ConvertTo-JsonManifest
    • New-JsonManifestStructure

• Schema identity and repository examples

  • Updated schema $id in Plaster/Schema/plaster-manifest-v2.json to the same reachable URL.
  • Updated all user-facing JSON examples/demos and README snippets to remove stale v2 links.

• Regression coverage

  • Tightened focused assertions so JSON output checks the exact $schema value (not just presence), preventing drift back to invalid URLs.

{
  "$schema": "https://raw.githubusercontent.com/PowerShellOrg/Plaster/main/Plaster/Schema/plaster-manifest-v2.json",
  "schemaVersion": "2.0"
}

• Fixes [Bug]: The schema from the example doesnt point to valid url #477

[Copilot]

Copilot review overview

🟢 Approval recommended

All reviewed changes align with the intended schema URL fix, with no unresolved review issues.

Review effort: Lite
Findings: None

What changed in this PR

This PR updates invalid JSON manifest schema references to the live Plaster schema URL.

Changes:

• Updated generated manifest schema URLs and schema identity.
• Updated README, examples, demos, and test fixtures.
• Added exact schema URL regression assertions.

File	Description
tests/​New-PlasterManifest.Tests.ps1	Verifies generated schema URL
tests/​ConvertTo-JsonManifest.Tests.ps1	Verifies converted schema URL
tests/​ConditionEval.Tests.ps1	Updates JSON fixtures
README.md	Updates JSON example
Plaster/​Schema/​plaster-manifest-v2.json	Updates schema identity
Plaster/​Public/​New-PlasterManifest.ps1	Updates generated URL
Plaster/​Public/​ConvertTo-JsonManifest.ps1	Updates converted URL
Plaster/​Private/​New-JsonManifestStructure.ps1	Updates generated structure
examples/​TemplateModule/​TemplateTwo/​plasterManifest.json	Updates example
examples/​TemplateModule/​TemplateOne/​plasterManifest.json	Updates example
examples/​plasterManifest.json	Updates example
examples/​plasterManifest-validatePattern.json	Updates example
examples/​plasterManifest_fr-FR.json	Updates example
examples/​NewPowerShellScript/​plasterManifest.json	Updates example
examples/​NewModule/​plasterManifest.json	Updates example
demos/​templates/​03-json-module/​plasterManifest.json	Updates demo
demos/​templates/​02-json-greeter/​plasterManifest.json	Updates demo

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