[WIP] Configure copilot agent to use COPILOT_GITHUB_TOKEN

[Copilot]

Plan: Configure copilot agent to use COPILOT_GITHUB_TOKEN as GH_TOKEN

Problem: The gh agent-task create command in create_agent_session.cjs doesn't have access to the COPILOT_GITHUB_TOKEN because it's only set as the github-token parameter for actions/github-script, not as an environment variable for the gh CLI command.

Reference: https://github.com/githubnext/gh-aw/actions/runs/21112904976/job/60714164240#step:22:1

Changes completed:

• Add GH_TOKEN and GITHUB_AW_AGENT_SESSION_BASE environment variables in the create-agent-session step (compiler_safe_outputs_specialized.go)
• Update create_agent_session.cjs to read GH_TOKEN from environment and validate it
• Pass GH_TOKEN to gh CLI command via env parameter in exec.getExecOutput
• Build and compile test workflow successfully
• Run unit tests - all passed
• Recompile all workflows with changes
• Run agent-finish to validate all changes (minor unrelated test failures in Docker/integration tests)

Original prompt

Reference: https://github.com/githubnext/gh-aw/actions/runs/21112904976/job/60714164240#step:22:1

Configure to run copilot agent using the same env as copilot COPILOT_GITHUB_TOKEN

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