Add Permission Handling documentation to all language READMEs

[jamesmontemagno]

This pull request updates the documentation for all SDKs (Node.js, Python, Go, .NET) to clarify that a permission handler is now required when creating or resuming a Copilot session. It adds detailed sections and examples for "Permission Handling", including how to use built-in helpers or provide custom logic to approve or deny tool executions. The changes also update all code samples, quick starts, and configuration references to include the required permission handler.

[Copilot]

Pull request overview

This PR updates the SDK documentation across Node.js/TypeScript, Python, Go, and .NET to reflect that an explicit permission handler is now required when creating or resuming a Copilot session, and adds new “Permission Handling” sections with examples and result-kind reference tables.

Changes:

• Update quick starts and session creation/resume examples to include the required permission handler.
• Add per-language “Permission Handling” documentation with approve-all and custom handler examples.
• Document permission decision result kinds and per-tool “skip permission” configuration.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 8 comments.

File	Description
python/README.md	Adds required on_permission_request guidance and Python permission handler examples/tables.
nodejs/README.md	Adds required onPermissionRequest guidance and TS permission handler examples/tables.
go/README.md	Adds required OnPermissionRequest guidance and Go permission handler examples/tables.
dotnet/README.md	Adds required OnPermissionRequest guidance and .NET permission handler examples/tables.

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