[Dreaming] Dreaming: clarify task host protocol capability checks

[github-actions]

Summary

• Adds one backend-execution instruction to derive remote capabilities from the negotiated packet version rather than startup/runtime assumptions.
• Requires task-host protocol changes to be validated on both .NET and .NET Framework.

Evidence

• In Forward console output from primary multithreaded task host #14859, review-driven fixes switched console setup from the startup version to the connection's negotiated version and extended the regression across both runtimes.
• In Handle cross-runtime task parameter binding #14913, reviewers challenged runtime assumptions and reflection over protocol internals, specifically directing capability checks toward NegotiatedPacketVersion.
• In Fix TaskHost routing order after nested build callbacks #15069, review caught that the documented fix still left the .NET Framework (msbuild.exe) path vulnerable, requiring correction.

This is a one-line addition to .github/instructions/backend-execution.instructions.md. I checked the other instruction, skill, and agent files; this negotiated-capability and dual-runtime requirement was not already covered.

Reviewers (core MSBuild team)

Suggested reviewers — core-team members who discussed this pattern (please assign): @dotnet/kitten

Warning

Firewall blocked 2 domains

The following domains were blocked by the firewall during workflow execution:

• api.github.com
• github.com

[!TIP]
api.github.com is blocked because GitHub API access uses the built-in GitHub tools by default. Instead of adding api.github.com to network.allowed, use tools.github.mode: gh-proxy for direct pre-authenticated GitHub CLI access without requiring network access to api.github.com:

tools:
  github:
    mode: gh-proxy

See GitHub Tools for more information on gh-proxy mode.

To allow these domains, add them to the network.allowed list in your workflow frontmatter:

network:
  allowed:
    - defaults
    - "api.github.com"
    - "github.com"

See Network Configuration for more information.

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